86 MCQs on Chapter 6: Life Processes | Class 10 Science | Important for SEBA / CBSE
In this article, you will get high-quality MCQs with answers and suitable explanations on the Life Process Chapter 6 Class 10 Science. It includes
- “SEBA 10 Years PYQ MCQs on Life Processes”
- “Assertion-Reason MCQs on Life Processes “
- “Statement-Based MCQs on Life Processes”
“Match the Following type MCQs on Life Processes”
To score 100 % marks in your HSLC/CBSE Board exam, we have provided 88 MCQs on Life Process in this article. We also provided simple Explanations so you can understand the chapter easily.
See More
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Ch-6: 86 MCQs on Life Process
Ch-10: 74 MCQs on Light – Reflection and Refraction
MCQs on Chapter 6: Life Processes
1. The breakdown of pyruvate to give carbon dioxide, water, and energy takes place in— [HSLC-2025, 26]
(a) cytoplasm
(b) mitochondria
(c) chloroplast
(d) nucleus
View Answer...
Explanation: The breakdown of glucose starts in the cytoplasm, where it is converted to pyruvate. After that, this pyruvate enters the mitochondria, where it breaks down completely in the presence of oxygen to give carbon dioxide, water, and a large amount of energy.
2. The kidneys in human beings are a part of the system for [HSLC-2025]
(a) excretion
(b) transportation
(c) nutrition
(d) respiration
View Answer...
Explanation: Excretion is the process of removing harmful metabolic waste from the body. The kidneys filter blood to remove toxic waste like urea in the form of urine. So, kidney the main organ of the human excretory system.
3. In human beings, the normal systolic pressure is about [HSLC-2025]
(a) 120 mm of Hg
(b) 100 mm of Hg
(c) 90 mm of Hg
(d) 105 mm of Hg
View Answer...
Explanation: Blood pressure has two limits. The upper limit during the contraction of the heart is called systolic pressure (Normal around 120 mm of Hg). The lower limit when the heart relaxes is called diastolic pressure (Normal around 80 mm of Hg).
4. Find out the name of the organ of human body which filters the waste and excess fluid from the blood. [HSLC-2026]
(a) Heart
(b) Lung
(c) Kidney
(d) Small intestine
View Answer...
5. Match the organs in Column-I with their functions in Column-II and select the correct option: [HSLC-2026]
Column-I | Column-II |
(i) Heart | (P) Blood transporting pipes in human |
(ii) Arteries and veins | (Q) Clotting of blood |
(iii) RBC | (R) Pumping organ |
(iv) Platelets | (S) Carrier of oxygen |
(a) (i)→(R), (ii)→(S), (iii)→(P), (iv)→(Q)
(b) (i)→(R), (ii)→(P), (iii)→(S), (iv)→(Q)
(c) (i)→(S), (ii)→(P), (iii)→(Q), (iv)→(R)
(d) (i)→(R), (ii)→(Q), (iii)→(P), (iv)→(S)
View Answer...
6. Which of the following statements is not correct regarding the role of stomata in plants? [HSLC-2026]
(a) Gaseous exchange that is necessary for the process of photosynthesis takes place through the stomata.
(b) Transpiration is controlled by the opening and closing of stomata.
(c) Stomata usually remains open during the day.
(d) Plants close their stomata to reduce water loss during dehydration.
View Answer...
7. Pancreatic juice contains digestive enzymes for breaking down of: [HSLC-2026]
(a) proteins and carbohydrates only.
(b) proteins and fats only.
(c) carbohydrates and fats only.
(d) proteins, fats and carbohydrates.
View Answer...
Explanation: The pancreas secretes pancreatic juice which contains major enzymes like trypsin (for breaking down proteins), lipase (for breaking down emulsified fats), and pancreatic amylase (for breaking down carbohydrates).
8. Amoeba engulfs food from its surrounding and forms a food vacuole with the help of the— [HSLC-2024]
(A) pseudopodia
(B) cilia
(C) flagella
(D) tentacles
View Answer...
9. Xylem tissues of the plants are responsible for [HSLC-2024]
(A) transportation of water
(B) transportation of food
(C) transportation of amino acids
(D) transportation of oxygen
View Answer...
Explanation: Plants have two main transport tissues. Xylem moves water and minerals upwards from the roots to the leaves. Phloem, on the other hand, transports food from the leaves to other parts of the plant.
10. To drive the reactions, endothermic processes in the cell use [HSLC-2024]
(A) ADP
(B) ATP
(C) AMP
(D) CO₂
View Answer...
Explanation: ATP (Adenosine Triphosphate) is known as the energy currency of the cell. Cells break down ATP to release energy.
11. Breakdown of glucose into pyruvate takes place in the – [HSLC-2023]
(a) Cytoplasm of cell
(b) Mitochondria
(c) Cell membrane
(d) Golgi body
View Answer...
Explanation: The very first step of respiration happens in the cytoplasm (the jelly-like fluid inside a cell). Here, a 6-carbon glucose molecule splits into two 3-carbon pyruvate molecules. This step does not require oxygen.
12. The energy currency for most cellular processes is – [HSLC-2023]
(a) ADP
(b) AMP
(c) ATP
(d) CO₂
View Answer...
13. Sphygmomanometer is an instrument used to measure the ________ of a person. [HSLC-2022]
(i) Blood pressure
(ii) O₂ level in blood
(iii) Blood sugar level
(iv) Urea level in blood
View Answer...
14. Hydrochloric acid released by the gastric glands in the stomach wall facilitates the action of enzyme called – [HSLC-2021]
(i) Pepsin
(ii) Trypsin
(iii) Amylase
(iv) Lipase
View Answer...
Explanation: The stomach produces a protein-digesting enzyme called pepsin. However, pepsin cannot work unless the environment is highly acidic. So, Hydrochloric acid (HCl) creates that acidic environment so pepsin can start breaking down proteins.
15. Anaerobic respiration occurs in – [HSLC-2016, 20]
(i) Mitochondria
(ii) Chloroplast
(iii) Nucleus
(iv) Cytoplasm
View Answer...
Explanation: Anaerobic respiration means breaking down food without oxygen (like in yeast cells or our muscles during heavy exercise). Anaerobic breakdown happens entirely in the cytoplasm.
16. The enzyme contained by our saliva is called – [HSLC-2019]
(i) Amylase
(ii) Lipase
(iii) Trypsin
(iv) Pepsin
View Answer...
Explanation: Our spit (saliva) contains an enzyme called salivary amylase. Its main job is to start digesting the starch present in our food right inside the mouth.
17. The name of the process by which carbon and energy requirements of an autotrophic organism are fulfilled is – [HSLC-2018]
(a) Photosynthesis
(b) Transpiration
(c) Translocation
(d) Photophosphorylation
View Answer...
Explanation: Autotrophs (like green plants) fulfill their carbon and energy needs through photosynthesis. They take in carbon dioxide and water from the environment and convert them into glucose using sunlight and chlorophyll.
18. The enzyme which converts starch to simple sugar is – [HSLC-2017]
(a) Amylase
(b) Lipase
(c) Pepsin
(d) Trypsin
View Answer...
19. The correct path of oxygen is—
(a) Lungs → Right Atrium → Right Ventricle → Body parts
(b) Lungs → Left Atrium → Left Ventricle → Body parts
(c) Lungs → Left Ventricle → Left Atrium → Body parts
(d) Lungs → Right Ventricle → Right Atrium → Body parts
View Answer...
Explanation:
Oxygen-rich blood comes from the lungs to the left atrium of the heart through the pulmonary veins. It then passes into the left ventricle, which pumps it to all body parts through the aorta.
20. Correct pathway of air during inhalation –
(a) nose/mouth → trachea → bronchi → bronchioles → alveoli
(b) alveoli → bronchioles → bronchi → trachea → nose/mouth
(c) nose/mouth → bronchi → trachea → bronchioles → alveoli
(d) alveoli → bronchi → trachea → bronchioles → nose/mouth
View Answer...
21. Match the following in correct order:
Parts of alimentary canal | Function |
A. Stomach | (i) Absorption of digested food |
B. Liver | (ii) Storage and egestion |
C. Small intestine | (iii) Secretion of bile |
D. Large intestine | (iv) Absorption of water |
(A) A-i, B-ii, C-iii, D-iv
(B) A-ii, B-iii, C-i, D-iv
(C) A-iii, B-iv, C-ii, D-i
(D) A-iv, B-i, C-ii, D-iii
View Answer...
22. Which of the following statement is / are true:
(i) The effect of root pressure in transportation of water is important at night.
(ii) During the day pressure of transpiration pull is important for transportation of water.
(a) Both (i) and (ii) correct
(b) Both (i) and (ii) false
(c) Only (i) is true
(d) Only (ii) is true
View Answer...
Explanation: At night, transpiration is very low because stomata are mostly closed. Therefore, root pressure helps push water upward through the plant. During the day, stomata are open and transpiration occurs actively. This creates a transpiration pull, which is the main force responsible for the upward movement of water.
23. Which of the following is more soluble in blood?
(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Carbon monoxide
View Answer...
Explanation: Carbon dioxide dissolves much more easily in water and blood plasma than oxygen. Because of this high solubility, most of the carbon dioxide is transported from our body tissues back to the lungs in a dissolved form through our blood plasma.
24. Assertion (A): Hydrochloric acid helps in the digestion of food in the stomach.
Reason (R): Hydrochloric acid neutralises the food particles.
(A) Both (A) and (R) are true and (R) is the correct explanation of (A)
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false
(D) (A) is false but (R) is true
View Answer...
Explanation: Hydrochloric acid, HCl definitely helps with digestion because it creates a highly acidic path that activates the enzyme pepsin. However, the reason is false because HCl makes the food highly acidic, it does not neutralize it.
25. Match the following with appropriate choices:
Column A | Column II |
A) Gastric Juice | (i) Guard cell |
B) Peristaltic | (ii) Mucus |
C) Stomata | (iii) Cilia |
D) Paramecium | (iv) Rhythmic expansion and relaxation of digestive tube |
(A) A-i, B-iii, C-ii, D-iv
(B) A-ii, B-iv, C-i, D-iii
(C) A-iv, B-iii, C-ii, D-i
(D) A-iii, B-iv, C-i, D-iii
View Answer...
26. If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will not take place properly?
(A) Proteins breaking down into amino acids
(B) Starch breaking down into sugars
(C) Fats breaking down into fatty acids and glycerol
(D) Absorption of vitamins
View Answer...
Explanation: Salivary amylase is present in our saliva. Its only job is to break down complex starch from our food into simpler sugars. If it is missing, this starch breakdown in the mouth stops.
27. (i) Organisms remove nitrogenous wastes through excretion.
(ii) Nephrons are large number of filtration units in human kidney.
(iii) Only oxygen is removed in plant excretion.
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (ii)
(d) only (i)
View Answer...
Explanation: Statement (i) correctly defines excretion, and statement (ii) accurately describes nephrons. Statement (iii) is wrong because plants excrete many other waste products besides oxygen, such as carbon dioxide, water vapor, gums, resins, and falling dry leaves.
28. Assertion (A): Aerobic respiration is an exothermic reaction.
Reason (R): A lot of energy is released during aerobic respiration.
(A) Both correct and R explains A
(B) A correct but R false
(C) A false but R correct
(D) Both false
View Answer...
Explanation: An exothermic reaction is any chemical reaction that produce heat or energy to its surroundings. Since aerobic respiration breaks down glucose completely to produce a massive amount of energy (stored as ATP). So, it is a classic example of an exothermic process.
29. Which of the following components of food is digested by amylase?
(A) Protein
(B) Fats
(C) Mineral
(D) Carbohydrates
View Answer...
30. The filtration unit of kidney are called:
(A) Urethra
(B) Ureters
(C) Neuron
(C) Nephron
View Answer...
Explanation: Each kidney contains millions of tiny, microscopic filtering structures called nephrons. They clean the blood and form urine.
31. Identify the correct path of urine flow in the human body:
(A) Kidney → Urinary bladder → Urethra → Ureters
(B) Urinary bladder → Ureters → Urethra → Kidney
(C) Kidney → Ureters → Urinary bladder → Urethra
(D) Kidney → Ureters → Urethra → Urinary bladder
View Answer...
Explanation: First, the Kidneys make the urine. Then, two long tubes called Ureters carry it down to a storage bag called the Urinary bladder. Finally, urine is passed out of the body through a small tube called the Urethra.
32. Assertion (A): The respiratory pigment present in red blood corpuscles is haemoglobin.
Reason (R): Platelets present in blood plug the leakage of bleeding in the injured area.
(A) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion
(B) Both Assertion and Reason are true but (R) is not the correct
(C) Assertion is false but Reason is correct
(D) Both Assertion and Reason are false
View Answer...
Explanation: Haemoglobin is the pigment that carries oxygen, and platelets stop bleeding by forming clots. However, the clotting action of platelets has nothing to do with why haemoglobin carries oxygen, so the Reason does not explain the Assertion.
33. When the terminal phosphate linkage in ATP is broken using water, the energy released is equivalent to:
(A) 30 KJ/Mol
(B) 30.5 KJ/Mol
(C) 31 KJ/Mol
(D) 30.6 KJ/Mol
View Answer...
34. Match the following with appropriate choices:
Column A | Column B |
(A) Gastric juice | (i) Guard cells |
(B) Peristaltic | (ii) Mucus |
(C) Stomata | (iii) Cilia |
(D) Paramecium | (iv) Rhythmic expansion and relaxation of digestive tube |
(A) (A)-(i), (B)-(iii), (C)-(ii), (D)-(iv)
(B) (A)-(ii), (B)-(iv), (C)-(i), (D)-(iii)
(C) (A)-(iv), (B)-(iii), (C)-(ii), (D)-(i)
(D) (A)-(iii), (B)-(iv), (C)-(i), (D)-(iii)
View Answer...
35. Which component of blood helps in clotting?
(A) RBC
(B) WBC
(C) Platelets
(D) Plasma
View Answer...
Explanation: Platelets are found in our blood. When we get a cut or an injury, Platelets rush to the spot and stick together to form a plug (clot) that stops the bleeding.
36. The correct sequence of the food canal of human body from mouth to anus is:
(A) Oesophagus → Stomach → Large intestine → Small intestine → Colon → Rectum → Anus
(B) Oesophagus → Stomach → Small intestine → Colon → Large intestine → Rectum → Anus
(C) Mouth → Oesophagus → Stomach → Large intestine → Small intestine → Colon → Rectum → Anus
(D) Mouth → Oesophagus → Stomach → Small intestine → Large intestine → Colon → Rectum → Anus
View Answer...
37. Select the correct answer to these questions:
(i) Mitochondria is called powerhouse of a cell.
(ii) In mitochondria ADP is produced during aerobic respiration.
(A) i is correct but ii is incorrect
(B) i is incorrect but ii is correct
(C) i and ii both are correct
(D) i and ii both are incorrect
View Answer...
38. Doctors measure the blood pressure with the instrument known as:
(A) Stethoscope
(B) Sphygmomanometer
(C) Thermometer
(D) Manometer
View Answer...
39. Which of the following option shows the transport of oxygen to the cell correctly?
(A) Lungs → Pulmonary Vein → Left atrium → Left ventricle → Aorta → Body cells
(B) Lungs → Pulmonary artery → Right atrium → Right ventricle → Aorta → Body cells
(C) Lungs → Pulmonary artery → Left atrium → Left ventricle → Aorta → Body cells
(D) Pulmonary artery → Lungs → Left atrium → Left ventricle → Aorta → Body cells
View Answer...
40. Respiration is the process in which:
(A) Energy is released and stored in the form of ATP
(B) Energy is stored in the form of ADP
(C) Energy is not released at all
(D) Energy is used up
View Answer...
Explanation: Respiration is a biochemical process where our cells break down glucose (food) using oxygen to release energy and stored in the form of ATP.
41. The autotrophic mode of nutrition requires:
(A) Carbon dioxide and water
(B) Chlorophyll
(C) Sunlight
(D) All of the above
View Answer...
Explanation:- Green plants prepare their food by using carbon dioxide and water in the presence of chlorophyll and sunlight.
42. Which of the following equations shows the correct conversion of CO₂ and H₂O into carbohydrates in plants?
(A) 6CO₂ + 6H₂O → C₂H₁₂O + 6O₂ + 12H₂O
(B) 6CO₂ + 6H₂O → C₂H₁₂O + 6O₂ + 12H₂O
(C) 6CO₂ + 12H₂O → C₆H₁₂O₆ + 6O₂ + 6H₂O
(D) 6CO₂ + 12H₂O → CH₂O + 6O₂ + 6H₂O
View Answer...
43. The characteristic processes observed in anaerobic respiration are:
(i) Presence of oxygen
(ii) Release of carbon dioxide
(iii) Release of energy
(iv) Release of lactic acid
Correct option:
(A) (i), (ii)
(B) (i), (ii), (iii)
(C) (ii), (iii), (iv)
(D) (iv)
View Answer...
Explanation: Anaerobic respiration happens without oxygen, so staement (i) is wrong. However, it produces carbon dioxide and energy (like in yeast), or lactic acid and energy (like in our muscle cells during a heavy exercise). Therefore, statements ii, iii, and iv are correct.
44. Which plant tissue transports water and minerals from the roots to the leaves and other parts of the plant?
(A) Xylem
(B) Phloem
(C) Parenchyma
(D) Collenchyma
View Answer...
45. Protein digesting enzyme present in stomach is:
(A) Salivary amylase
(B) Trypsin
(C) Pepsin
(D) Lipase
View Answer...
Explanation: Gastric glands in the stomach release an enzyme called pepsin. Pepsin breaks complex proteins down into smaller pieces. (Trypsin also digests protein, but it works in the small intestine, not the stomach).
46. Structural and functional unit of kidney is:
(A) Urinary bladder
(B) Ureter
(C) Urethra
(D) Nephron
View Answer...
47. Human blood is purified in:
(A) Lungs
(B) Kidneys
(C) Heart
(D) Liver
View Answer...
Explanation: The kidneys clean and purify our blood by removing nitrogenous wastes like urea.
48. For a stomata diagram, the correct labelling sequence is:
(a) Epidermal cells, stomatal pore, guard cells, chloroplasts
(b) Guard cells, stomatal pore, epidermal cells, chloroplasts
(c) Stomatal pore, epidermal cells, chloroplast, guard cells
(d) Chloroplast, stomatal pore, epidermal cells, guard cells
View Answer...
49. The process used to remove nitrogenous waste from blood using an artificial kidney is:
(a) Transpiration
(b) Filtration
(c) Dialysis
(d) Double circulation
View Answer...
Explanation: When a person’s kidneys fail, an artificial kidney machine is used to clean their blood. This medical process is called dialysis (or hemodialysis).
50. Which is NOT an example of heterotrophic nutrition?
(a) Human
(b) Tiger
(c) Algae
(d) Cow
View Answer...
Explanation: Heterotrophs cannot make their own food and depend on others. Humans, tigers, and cows are all heterotrophs. Algae contain chlorophyll and perform photosynthesis to make their own food. So, Algae’s mode of nutrition is autotrophic.
51. Match Column I with Column II:
Column I | Column II |
1) Heart | A. Attraction for $O_2$ |
2) Double circulation of blood | B. Found in lungs |
3) Air sacs | C. Pumps blood |
4) Haemoglobin | D. Found in birds and mammals |
(a) 1→D, 2→C, 3→A, 4→B
(b) 1→C, 2→A, 3→B, 4→D
(c) 1→C, 2→D, 3→B, 4→A
(d) 1→B, 2→A, 3→D, 4→C
View Answer...
52. Two statements A and B are given. Choose:
A: Haemoglobin carries oxygen as oxyhaemoglobin.
B: Haemoglobin has high affinity for oxygen.
(A)both A, B true
(B) A true, B false
(C) A false, B true
(D) both false
View Answer...
Explanation: Haemoglobin loves oxygen (high affinity), binds with it tightly to form a temporary compound called oxyhaemoglobin, and safely carries it from the lungs to all body tissues.
53. Carbohydrates are stored in our body in the form of –
(a) Glucose
(b) Glycogen
(c) Starch
(d) None of these
View Answer...
Explanation: While plants store their extra food/carbohydrates as starch, animals (including humans) convert extra glucose into glycogen and store it safely in the liver and muscle cells for future use.
54. Breakdown of pyruvate to lactic acid and energy takes place in –
(a) Cytoplasm
(b) Mitochondria
(c) Chloroplast
(d) Muscle cells
View Answer...
55. Correct matching of digestive juices and enzymes –
(a) Saliva–trypsin, gastric juice–lipase, pancreatic juice–pepsin, intestinal juice–amylase
(b) Saliva–amylase, gastric juice–trypsin, pancreatic juice–lipase, intestinal juice–pepsin
(c) Saliva–amylase, gastric juice–pepsin, pancreatic juice–trypsin, intestinal juice–peptidases
(d) Saliva–amylase, gastric juice–pepsin, pancreatic juice–peptidases, intestinal juice–trypsin
View Answer...
Explanation:
Saliva contains salivary amylase.
Gastric juice (stomach) contains pepsin.
Pancreatic juice contains trypsin (along with lipase and amylase).
Intestinal juice contains final protein-cleaving enzymes like peptidases.
56. Digestion of proteins starts in –
(a) Buccal cavity
(b) Stomach
(c) Small intestine
(d) Large intestine
View Answer...
57. Sudden cramps in muscles during heavy exercise are due to accumulation of –
(a) Ethanol
(b) Lactic acid
(c) Excess energy
(d) Carbon dioxide
View Answer...
58. In the process of photosynthesis, carbohydrates are produced by:
(A) Reduction of glucose
(B) Reduction of CO₂
(C) Oxidation of glucose
(D) Oxidation of CO₂
View Answer...
59. Amino acids are polymeric units of:
(A) Glucose
(B) Starch
(C) Protein
(D) Fat
View Answer...
Explanation: Amino acids are the basic building blocks (polymeric units) of proteins.
60. Rice–water turns blue–black with iodine, indicating presence of –
(a) Fat
(b) Complex protein
(c) Starch
(d) Simple protein
View Answer...
Explanation: Starch is a carbohydrate heavily present in rice. When iodine comes into contact with starch, it changes to dark blue-black.
61. In anaerobic respiration in yeast, which are correct?
I: No oxygen present
II: CO₂ produced
III: Energy produced
IV: Lactic acid produced
(a)I, II
(b) II, III, IV
(c) I, II, III
(d) IV
View Answer...
Explanation: Anaerobic respiration (in yeast) is the breakdown of food without oxygen(I) , it breaks down glucose into ethanol, carbon dioxide (II), and a small amount of energy (III). Lactic acid (IV) is only produced in animal muscle cells during heavy exercise, not in yeast.
62. Emulsification of fat molecule is carried out by:
(A) Trypsin
(B) Pepsin
(C) Bile salts
(D) Amylase
View Answer...
Explanation:- Bile salt breaks down large fat molecules into tiny bubbles (globules) to help enzymes work better; this is called emulsification.
63. Which of the equation shows the correct conversion of CO₂ and H₂O into carbohydrates in plants?
(A) 6CO₂ + 6H₂O + Heat Energy → C₆H₁₂O₆ + 6O₂ + 12H₂O (with Chlorophyll)
(B) 6CO₂ + 6H₂O → CH₂O + 6O₂ + 12H₂O (with Sunlight and Chlorophyll)
(C) 6CO₂ + 12H₂O + Heat Energy → C₆H₁₂O₆ + 6O₂ + 6H₂O (with Chlorophyll)
(D) 6CO₂ + 12H₂O + Sunlight → C₆H₁₂O₆ + 6O₂ + 6H₂O (with Chlorophyll)
View Answer...
64. Excess carbohydrates of plants are stored in cell is:
(A) Starch
(B) Glucose
(C) Glycogen
(D) Fats
View Answer...
Explanation: Plants make plenty of glucose during the day via photosynthesis. Excess carbohydrates (glucose) of plants are stored in cell is as starch inside their cells for later use.
65. Steps for starch test on green leaf:
a) Boil leaf in alcohol
b) Boil leaf in water
c) Dip in iodine solution
d) Wash leaf in water
Correct sequence:
(A) a d b c
(B) d a b c
(C) b d a c
(D) b a d c
View Answer...
66. Assertion (A): During daytime, amount of CO₂ released by plants negligible.
Reason (R): CO₂ produced in respiration is used in photosynthesis.
(A) Both correct and R explains A
(B) A correct but R false
(C) A false but R correct
(D) Both false
View Answer...
67. Energy is stored in plants and human body respectively as:
(a) Starch and glycogen
(b) Glycogen and starch
(c) Starch and Glucose
(d) Glycogen and ATP
View Answer...
68. Which of the following is NOT a protein synthesizing enzyme?
(a) Trypsin
(b) Lipase
(c) Mucus
(d) Pepsin
View Answer...
Explanation: Trypsin and Pepsin are protein-digesting enzymes. Lipase breaks down fats, and Mucus is a protective slimy layer, not an enzyme.
69. Blood clotting is related to:
(a) Haemoglobin
(b) Lymph
(c) Platelets
(d) Red blood cell
View Answer...
70. Mode of nutrition where organism derives food from another living organism without harming it:
(A) Parasitic nutrition
(B) Saprophytic nutrition
(C) Autotrophic nutrition
(a) Only A
(b) A and B
(c) Only C
(d) B and C
View Answer...
Explanation: Parasites (like leeches, ticks, or lice) feed directly from a host organism without killing it. Saprophytes feed on dead things, and autotrophs make their own food.
71. If salivary amylase is lacking, which event is affected?
(a) Proteins breaking down into amino acids
(b) Absorption of vitamins
(c) Starch breaking down into sugars
(d) Fats breaking down into fatty acids and glycerol
View Answer...
72. During respiration, gas exchange takes place in—
(a) Trachea and Larynx
(b) Alveoli of lungs
(c) Pharynx and Larynx
(d) Bronchi and Trachea
View Answer...
Explanation: The actual exchange of gases (oxygen crossing into the blood and carbon dioxide moving out) happens exclusively in the ultra-thin alveoli (air sacs) inside the lungs.
73. Thinnest blood vessels are:
(a) Arteries
(b) Veins
(c) Blood Capillaries
(d) Pulmonary artery
View Answer...
Explanation: Capillaries are ultra-thin, microscopic blood vessels. They connect arteries to veins and where the actual exchange of material between blood and cells occurs.
74. During muscle cramps which of the following accumulates in our muscles?
(a) Carbon dioxide
(b) Alcohol
(c) Lactose
(d) Lactic Acid
View Answer...
75. Digestion of food starts from which organ of the digestive system?
(a) Mouth due to the presence of saliva
(b) Oesophagus that moves the food in gut
(c) That releases juices for fat break down
(d) Which helps in mixing food with digestive juices
View Answer...
76. An athlete after a long break of his routine exercise, suffered muscular cramps during a heavy exercise session. This happened due to:
(A) Lack of carbon dioxide and formation of pyruvate
(B) Presence of oxygen and formation of ethanol
(C) Lack of oxygen and formation of lactic acid
(D) Lack of oxygen and formation of carbon dioxide
View Answer...
77. A person is suffering from Hypertension. In Sphygmomanometer his reading is:
(A) 120/80
(B) 110/60
(C) 120/75
(D) 140/90
View Answer...
Explanation: Normal adult blood pressure is roughly 120/80 mm of Hg. Hypertension is the medical term for high blood pressure. A high reading like 140/90 mm of Hg or above clearly indicates hypertension.
78. What is the process by which cells break down nutrients using oxygen to gain energy?
(A) Respiration
(B) Photosynthesis
(C) Endocytosis
(D) Exocytosis
View Answer...
79. Which of the following statements about aerobic respiration is correct?
(A) It occurs in the absence of O₂
(B) It produces more ATP than anaerobic respiration
(C) It occurs only in cells of animals
(D) It produces lactic acid after breaking down of glucose
View Answer...
Explanation: In aerobic respiration, glucose is broken down in the presence of oxygen (O₂). This process releases a large amount of energy and produces more ATP than anaerobic respiration.
80. Assertion: Saliva contains pepsin enzyme.
Reason: Pepsin digests starch into simple sugar.
(A) Both correct and R explains A
(B) A correct but R false
(C) A false but R correct
(D) Both false
View Answer...
81. The autotrophic mode of nutrition requires –
(A) Carbon dioxide and water
(B) Chlorophyll
(C) Sunlight
(D) All of the above
View Answer...
82. The process of acquiring oxygen from outside the body and using it in breakdown of food for cellular needs is called –
(A) Nutrition
(B) Transportation
(C) Excretion
(D) Respiration
View Answer...
83. Which one is the site of complete digestion of carbohydrates, proteins and fats in our body?
(A) Stomach
(B) Mouth cavity
(C) Small intestine
(D) Large intestine
View Answer...
84. The cup-shaped end of a nephron is called –
(A) Glomerulus
(B) Collecting duct
(C) Ureter
(D) Bowman’s capsule
View Answer...
85. Which enzyme is responsible for the conversion of starch into maltose in human digestion?
(a) Amylase
(b) Lipase
(c) Pepsin
(d) Trypsin
View Answer...
86. Blood vessel which carries blood back to heart from the body is –
(a) Artery
(b) Vein
(c) Capillary
(d) Nerve
View Answer...
Explanation:
Veins carry blood back to the heart from different parts of the body.
Arteries carry blood away from the heart.
Veins carry blood toward the heart.
Capillaries are tiny blood vessels that connect arteries and veins.
Nerves are not blood vessels.
86 MCQs on Chapter 6: Life Processes | Class 10 Science | Important for SEBA / CBSE
In this article, you will get high-quality MCQs with answers and suitable explanations on the Life Process Chapter 6 Class 10 Science. It includes
- “SEBA 10 Years PYQ MCQs”
“Assertion-Reason MCQs on Life Processes “
- “Statement-Based MCQs”
- “Match the Following type MCQs”
To score 100 % marks in your HSLC/CBSE Board exam, we have provided 88 MCQs on Life Process in this article. We also provided simple Explanations so you can understand the chapter easily.
See More
Ch-1: 71 MCQs on Chemical Reactions and Equations
Ch-5: 88 MCQs on Periodic Classification of Elements
Ch-6: 86 MCQs on Life Process
Ch-10: MCQs on Light – Reflection and Refraction
MCQs on Chapter 6: Life Processes
1. The breakdown of pyruvate to give carbon dioxide, water, and energy takes place in— [HSLC-2025, 26]
(a) cytoplasm
(b) mitochondria
(c) chloroplast
(d) nucleus
View Answer...
Explanation: The breakdown of glucose starts in the cytoplasm, where it is converted to pyruvate. After that, this pyruvate enters the mitochondria, where it breaks down completely in the presence of oxygen to give carbon dioxide, water, and a large amount of energy.
2. The kidneys in human beings are a part of the system for [HSLC-2025]
(a) excretion
(b) transportation
(c) nutrition
(d) respiration
View Answer...
Explanation: Excretion is the process of removing harmful metabolic waste from the body. The kidneys filter blood to remove toxic waste like urea in the form of urine. So, kidney the main organ of the human excretory system.
3. In human beings, the normal systolic pressure is about [HSLC-2025]
(a) 120 mm of Hg
(b) 100 mm of Hg
(c) 90 mm of Hg
(d) 105 mm of Hg
View Answer...
Explanation: Blood pressure has two limits. The upper limit during the contraction of the heart is called systolic pressure (Normal around 120 mm of Hg). The lower limit when the heart relaxes is called diastolic pressure (Normal around 80 mm of Hg).
4. Find out the name of the organ of human body which filters the waste and excess fluid from the blood. [HSLC-2026]
(a) Heart
(b) Lung
(c) Kidney
(d) Small intestine
View Answer...
5. Match the organs in Column-I with their functions in Column-II and select the correct option: [HSLC-2026]
Column-I | Column-II |
(i) Heart | (P) Blood transporting pipes in human |
(ii) Arteries and veins | (Q) Clotting of blood |
(iii) RBC | (R) Pumping organ |
(iv) Platelets | (S) Carrier of oxygen |
(a) (i)→(R), (ii)→(S), (iii)→(P), (iv)→(Q)
(b) (i)→(R), (ii)→(P), (iii)→(S), (iv)→(Q)
(c) (i)→(S), (ii)→(P), (iii)→(Q), (iv)→(R)
(d) (i)→(R), (ii)→(Q), (iii)→(P), (iv)→(S)
View Answer...
6. Which of the following statements is not correct regarding the role of stomata in plants? [HSLC-2026]
(a) Gaseous exchange that is necessary for the process of photosynthesis takes place through the stomata.
(b) Transpiration is controlled by the opening and closing of stomata.
(c) Stomata usually remains open during the day.
(d) Plants close their stomata to reduce water loss during dehydration.
View Answer...
7. Pancreatic juice contains digestive enzymes for breaking down of: [HSLC-2026]
(a) proteins and carbohydrates only.
(b) proteins and fats only.
(c) carbohydrates and fats only.
(d) proteins, fats and carbohydrates.
View Answer...
Explanation: The pancreas secretes pancreatic juice which contains major enzymes like trypsin (for breaking down proteins), lipase (for breaking down emulsified fats), and pancreatic amylase (for breaking down carbohydrates).
8. Amoeba engulfs food from its surrounding and forms a food vacuole with the help of the— [HSLC-2024]
(A) pseudopodia
(B) cilia
(C) flagella
(D) tentacles
View Answer...
9. Xylem tissues of the plants are responsible for [HSLC-2024]
(A) transportation of water
(B) transportation of food
(C) transportation of amino acids
(D) transportation of oxygen
View Answer...
Explanation: Plants have two main transport tissues. Xylem moves water and minerals upwards from the roots to the leaves. Phloem, on the other hand, transports food from the leaves to other parts of the plant.
10. To drive the reactions, endothermic processes in the cell use [HSLC-2024]
(A) ADP
(B) ATP
(C) AMP
(D) CO₂
View Answer...
Explanation: ATP (Adenosine Triphosphate) is known as the energy currency of the cell. Cells break down ATP to release energy.
11. Breakdown of glucose into pyruvate takes place in the – [HSLC-2023]
(a) Cytoplasm of cell
(b) Mitochondria
(c) Cell membrane
(d) Golgi body
View Answer...
Explanation: The very first step of respiration happens in the cytoplasm (the jelly-like fluid inside a cell). Here, a 6-carbon glucose molecule splits into two 3-carbon pyruvate molecules. This step does not require oxygen.
12. The energy currency for most cellular processes is – [HSLC-2023]
(a) ADP
(b) AMP
(c) ATP
(d) CO₂
View Answer...
13. Sphygmomanometer is an instrument used to measure the ________ of a person. [HSLC-2022]
(i) Blood pressure
(ii) O₂ level in blood
(iii) Blood sugar level
(iv) Urea level in blood
View Answer...
14. Hydrochloric acid released by the gastric glands in the stomach wall facilitates the action of enzyme called – [HSLC-2021]
(i) Pepsin
(ii) Trypsin
(iii) Amylase
(iv) Lipase
View Answer...
Explanation: The stomach produces a protein-digesting enzyme called pepsin. However, pepsin cannot work unless the environment is highly acidic. So, Hydrochloric acid (HCl) creates that acidic environment so pepsin can start breaking down proteins.
15. Anaerobic respiration occurs in – [HSLC-2016, 20]
(i) Mitochondria
(ii) Chloroplast
(iii) Nucleus
(iv) Cytoplasm
View Answer...
Explanation: Anaerobic respiration means breaking down food without oxygen (like in yeast cells or our muscles during heavy exercise). Anaerobic breakdown happens entirely in the cytoplasm.
16. The enzyme contained by our saliva is called – [HSLC-2019]
(i) Amylase
(ii) Lipase
(iii) Trypsin
(iv) Pepsin
View Answer...
Explanation: Our spit (saliva) contains an enzyme called salivary amylase. Its main job is to start digesting the starch present in our food right inside the mouth.
17. The name of the process by which carbon and energy requirements of an autotrophic organism are fulfilled is – [HSLC-2018]
(a) Photosynthesis
(b) Transpiration
(c) Translocation
(d) Photophosphorylation
View Answer...
Explanation: Autotrophs (like green plants) fulfill their carbon and energy needs through photosynthesis. They take in carbon dioxide and water from the environment and convert them into glucose using sunlight and chlorophyll.
18. The enzyme which converts starch to simple sugar is – [HSLC-2017]
(a) Amylase
(b) Lipase
(c) Pepsin
(d) Trypsin
View Answer...
19. The correct path of oxygen is—
(a) Lungs → Right Atrium → Right Ventricle → Body parts
(b) Lungs → Left Atrium → Left Ventricle → Body parts
(c) Lungs → Left Ventricle → Left Atrium → Body parts
(d) Lungs → Right Ventricle → Right Atrium → Body parts
View Answer...
Explanation:
Oxygen-rich blood comes from the lungs to the left atrium of the heart through the pulmonary veins. It then passes into the left ventricle, which pumps it to all body parts through the aorta.
20. Correct pathway of air during inhalation –
(a) nose/mouth → trachea → bronchi → bronchioles → alveoli
(b) alveoli → bronchioles → bronchi → trachea → nose/mouth
(c) nose/mouth → bronchi → trachea → bronchioles → alveoli
(d) alveoli → bronchi → trachea → bronchioles → nose/mouth
View Answer...
21. Match the following in correct order:
Parts of alimentary canal | Function |
A. Stomach | (i) Absorption of digested food |
B. Liver | (ii) Storage and egestion |
C. Small intestine | (iii) Secretion of bile |
D. Large intestine | (iv) Absorption of water |
(A) A-i, B-ii, C-iii, D-iv
(B) A-ii, B-iii, C-i, D-iv
(C) A-iii, B-iv, C-ii, D-i
(D) A-iv, B-i, C-ii, D-iii
View Answer...
22. Which of the following statement is / are true:
(i) The effect of root pressure in transportation of water is important at night.
(ii) During the day pressure of transpiration pull is important for transportation of water.
(a) Both (i) and (ii) correct
(b) Both (i) and (ii) false
(c) Only (i) is true
(d) Only (ii) is true
View Answer...
Explanation: At night, transpiration is very low because stomata are mostly closed. Therefore, root pressure helps push water upward through the plant. During the day, stomata are open and transpiration occurs actively. This creates a transpiration pull, which is the main force responsible for the upward movement of water.
23. Which of the following is more soluble in blood?
(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Carbon monoxide
View Answer...
Explanation: Carbon dioxide dissolves much more easily in water and blood plasma than oxygen. Because of this high solubility, most of the carbon dioxide is transported from our body tissues back to the lungs in a dissolved form through our blood plasma.
24. Assertion (A): Hydrochloric acid helps in the digestion of food in the stomach.
Reason (R): Hydrochloric acid neutralises the food particles.
(A) Both (A) and (R) are true and (R) is the correct explanation of (A)
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false
(D) (A) is false but (R) is true
View Answer...
Explanation: Hydrochloric acid, HCl definitely helps with digestion because it creates a highly acidic path that activates the enzyme pepsin. However, the reason is false because HCl makes the food highly acidic, it does not neutralize it.
25. Match the following with appropriate choices:
Column A | Column II |
A) Gastric Juice | (i) Guard cell |
B) Peristaltic | (ii) Mucus |
C) Stomata | (iii) Cilia |
D) Paramecium | (iv) Rhythmic expansion and relaxation of digestive tube |
(A) A-i, B-iii, C-ii, D-iv
(B) A-ii, B-iv, C-i, D-iii
(C) A-iv, B-iii, C-ii, D-i
(D) A-iii, B-iv, C-i, D-iii
View Answer...
26. If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will not take place properly?
(A) Proteins breaking down into amino acids
(B) Starch breaking down into sugars
(C) Fats breaking down into fatty acids and glycerol
(D) Absorption of vitamins
View Answer...
Explanation: Salivary amylase is present in our saliva. Its only job is to break down complex starch from our food into simpler sugars. If it is missing, this starch breakdown in the mouth stops.
27. (i) Organisms remove nitrogenous wastes through excretion.
(ii) Nephrons are large number of filtration units in human kidney.
(iii) Only oxygen is removed in plant excretion.
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (ii)
(d) only (i)
View Answer...
Explanation: Statement (i) correctly defines excretion, and statement (ii) accurately describes nephrons. Statement (iii) is wrong because plants excrete many other waste products besides oxygen, such as carbon dioxide, water vapor, gums, resins, and falling dry leaves.
28. Assertion (A): Aerobic respiration is an exothermic reaction.
Reason (R): A lot of energy is released during aerobic respiration.
(A) Both correct and R explains A
(B) A correct but R false
(C) A false but R correct
(D) Both false
View Answer...
Explanation: An exothermic reaction is any chemical reaction that produce heat or energy to its surroundings. Since aerobic respiration breaks down glucose completely to produce a massive amount of energy (stored as ATP). So, it is a classic example of an exothermic process.
29. Which of the following components of food is digested by amylase?
(A) Protein
(B) Fats
(C) Mineral
(D) Carbohydrates
View Answer...
30. The filtration unit of kidney are called:
(A) Urethra
(B) Ureters
(C) Neuron
(C) Nephron
View Answer...
Explanation: Each kidney contains millions of tiny, microscopic filtering structures called nephrons. They clean the blood and form urine.
31. Identify the correct path of urine flow in the human body:
(A) Kidney → Urinary bladder → Urethra → Ureters
(B) Urinary bladder → Ureters → Urethra → Kidney
(C) Kidney → Ureters → Urinary bladder → Urethra
(D) Kidney → Ureters → Urethra → Urinary bladder
View Answer...
Explanation: First, the Kidneys make the urine. Then, two long tubes called Ureters carry it down to a storage bag called the Urinary bladder. Finally, urine is passed out of the body through a small tube called the Urethra.
32. Assertion (A): The respiratory pigment present in red blood corpuscles is haemoglobin.
Reason (R): Platelets present in blood plug the leakage of bleeding in the injured area.
(A) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion
(B) Both Assertion and Reason are true but (R) is not the correct
(C) Assertion is false but Reason is correct
(D) Both Assertion and Reason are false
View Answer...
Explanation: Haemoglobin is the pigment that carries oxygen, and platelets stop bleeding by forming clots. However, the clotting action of platelets has nothing to do with why haemoglobin carries oxygen, so the Reason does not explain the Assertion.
33. When the terminal phosphate linkage in ATP is broken using water, the energy released is equivalent to:
(A) 30 KJ/Mol
(B) 30.5 KJ/Mol
(C) 31 KJ/Mol
(D) 30.6 KJ/Mol
View Answer...
34. Match the following with appropriate choices:
Column A | Column B |
(A) Gastric juice | (i) Guard cells |
(B) Peristaltic | (ii) Mucus |
(C) Stomata | (iii) Cilia |
(D) Paramecium | (iv) Rhythmic expansion and relaxation of digestive tube |
(A) (A)-(i), (B)-(iii), (C)-(ii), (D)-(iv)
(B) (A)-(ii), (B)-(iv), (C)-(i), (D)-(iii)
(C) (A)-(iv), (B)-(iii), (C)-(ii), (D)-(i)
(D) (A)-(iii), (B)-(iv), (C)-(i), (D)-(iii)
View Answer...
35. Which component of blood helps in clotting?
(A) RBC
(B) WBC
(C) Platelets
(D) Plasma
View Answer...
Explanation: Platelets are found in our blood. When we get a cut or an injury, Platelets rush to the spot and stick together to form a plug (clot) that stops the bleeding.
36. The correct sequence of the food canal of human body from mouth to anus is:
(A) Oesophagus → Stomach → Large intestine → Small intestine → Colon → Rectum → Anus
(B) Oesophagus → Stomach → Small intestine → Colon → Large intestine → Rectum → Anus
(C) Mouth → Oesophagus → Stomach → Large intestine → Small intestine → Colon → Rectum → Anus
(D) Mouth → Oesophagus → Stomach → Small intestine → Large intestine → Colon → Rectum → Anus
View Answer...
37. Select the correct answer to these questions:
(i) Mitochondria is called powerhouse of a cell.
(ii) In mitochondria ADP is produced during aerobic respiration.
(A) i is correct but ii is incorrect
(B) i is incorrect but ii is correct
(C) i and ii both are correct
(D) i and ii both are incorrect
View Answer...
38. Doctors measure the blood pressure with the instrument known as:
(A) Stethoscope
(B) Sphygmomanometer
(C) Thermometer
(D) Manometer
View Answer...
39. Which of the following option shows the transport of oxygen to the cell correctly?
(A) Lungs → Pulmonary Vein → Left atrium → Left ventricle → Aorta → Body cells
(B) Lungs → Pulmonary artery → Right atrium → Right ventricle → Aorta → Body cells
(C) Lungs → Pulmonary artery → Left atrium → Left ventricle → Aorta → Body cells
(D) Pulmonary artery → Lungs → Left atrium → Left ventricle → Aorta → Body cells
View Answer...
40. Respiration is the process in which:
(A) Energy is released and stored in the form of ATP
(B) Energy is stored in the form of ADP
(C) Energy is not released at all
(D) Energy is used up
View Answer...
Explanation: Respiration is a biochemical process where our cells break down glucose (food) using oxygen to release energy and stored in the form of ATP.
41. The autotrophic mode of nutrition requires:
(A) Carbon dioxide and water
(B) Chlorophyll
(C) Sunlight
(D) All of the above
View Answer...
Explanation:- Green plants prepare their food by using carbon dioxide and water in the presence of chlorophyll and sunlight.
42. Which of the following equations shows the correct conversion of CO₂ and H₂O into carbohydrates in plants?
(A) 6CO₂ + 6H₂O → C₂H₁₂O + 6O₂ + 12H₂O
(B) 6CO₂ + 6H₂O → C₂H₁₂O + 6O₂ + 12H₂O
(C) 6CO₂ + 12H₂O → C₆H₁₂O₆ + 6O₂ + 6H₂O
(D) 6CO₂ + 12H₂O → CH₂O + 6O₂ + 6H₂O
View Answer...
43. The characteristic processes observed in anaerobic respiration are:
(i) Presence of oxygen
(ii) Release of carbon dioxide
(iii) Release of energy
(iv) Release of lactic acid
Correct option:
(A) (i), (ii)
(B) (i), (ii), (iii)
(C) (ii), (iii), (iv)
(D) (iv)
View Answer...
Explanation: Anaerobic respiration happens without oxygen, so staement (i) is wrong. However, it produces carbon dioxide and energy (like in yeast), or lactic acid and energy (like in our muscle cells during a heavy exercise). Therefore, statements ii, iii, and iv are correct.
44. Which plant tissue transports water and minerals from the roots to the leaves and other parts of the plant?
(A) Xylem
(B) Phloem
(C) Parenchyma
(D) Collenchyma
View Answer...
45. Protein digesting enzyme present in stomach is:
(A) Salivary amylase
(B) Trypsin
(C) Pepsin
(D) Lipase
View Answer...
Explanation: Gastric glands in the stomach release an enzyme called pepsin. Pepsin breaks complex proteins down into smaller pieces. (Trypsin also digests protein, but it works in the small intestine, not the stomach).
46. Structural and functional unit of kidney is:
(A) Urinary bladder
(B) Ureter
(C) Urethra
(D) Nephron
View Answer...
47. Human blood is purified in:
(A) Lungs
(B) Kidneys
(C) Heart
(D) Liver
View Answer...
Explanation: The kidneys clean and purify our blood by removing nitrogenous wastes like urea.
48. For a stomata diagram, the correct labelling sequence is:
(a) Epidermal cells, stomatal pore, guard cells, chloroplasts
(b) Guard cells, stomatal pore, epidermal cells, chloroplasts
(c) Stomatal pore, epidermal cells, chloroplast, guard cells
(d) Chloroplast, stomatal pore, epidermal cells, guard cells
View Answer...
49. The process used to remove nitrogenous waste from blood using an artificial kidney is:
(a) Transpiration
(b) Filtration
(c) Dialysis
(d) Double circulation
View Answer...
Explanation: When a person’s kidneys fail, an artificial kidney machine is used to clean their blood. This medical process is called dialysis (or hemodialysis).
50. Which is NOT an example of heterotrophic nutrition?
(a) Human
(b) Tiger
(c) Algae
(d) Cow
View Answer...
Explanation: Heterotrophs cannot make their own food and depend on others. Humans, tigers, and cows are all heterotrophs. Algae contain chlorophyll and perform photosynthesis to make their own food. So, Algae’s mode of nutrition is autotrophic.
51. Match Column I with Column II:
Column I | Column II |
1) Heart | A. Attraction for $O_2$ |
2) Double circulation of blood | B. Found in lungs |
3) Air sacs | C. Pumps blood |
4) Haemoglobin | D. Found in birds and mammals |
(a) 1→D, 2→C, 3→A, 4→B
(b) 1→C, 2→A, 3→B, 4→D
(c) 1→C, 2→D, 3→B, 4→A
(d) 1→B, 2→A, 3→D, 4→C
View Answer...
52. Two statements A and B are given. Choose:
A: Haemoglobin carries oxygen as oxyhaemoglobin.
B: Haemoglobin has high affinity for oxygen.
(A)both A, B true
(B) A true, B false
(C) A false, B true
(D) both false
View Answer...
Explanation: Haemoglobin loves oxygen (high affinity), binds with it tightly to form a temporary compound called oxyhaemoglobin, and safely carries it from the lungs to all body tissues.
53. Carbohydrates are stored in our body in the form of –
(a) Glucose
(b) Glycogen
(c) Starch
(d) None of these
View Answer...
Explanation: While plants store their extra food/carbohydrates as starch, animals (including humans) convert extra glucose into glycogen and store it safely in the liver and muscle cells for future use.
54. Breakdown of pyruvate to lactic acid and energy takes place in –
(a) Cytoplasm
(b) Mitochondria
(c) Chloroplast
(d) Muscle cells
View Answer...
55. Correct matching of digestive juices and enzymes –
(a) Saliva–trypsin, gastric juice–lipase, pancreatic juice–pepsin, intestinal juice–amylase
(b) Saliva–amylase, gastric juice–trypsin, pancreatic juice–lipase, intestinal juice–pepsin
(c) Saliva–amylase, gastric juice–pepsin, pancreatic juice–trypsin, intestinal juice–peptidases
(d) Saliva–amylase, gastric juice–pepsin, pancreatic juice–peptidases, intestinal juice–trypsin
View Answer...
Explanation:
Saliva contains salivary amylase.
Gastric juice (stomach) contains pepsin.
Pancreatic juice contains trypsin (along with lipase and amylase).
Intestinal juice contains final protein-cleaving enzymes like peptidases.
56. Digestion of proteins starts in –
(a) Buccal cavity
(b) Stomach
(c) Small intestine
(d) Large intestine
View Answer...
57. Sudden cramps in muscles during heavy exercise are due to accumulation of –
(a) Ethanol
(b) Lactic acid
(c) Excess energy
(d) Carbon dioxide
View Answer...
58. In the process of photosynthesis, carbohydrates are produced by:
(A) Reduction of glucose
(B) Reduction of CO₂
(C) Oxidation of glucose
(D) Oxidation of CO₂
View Answer...
59. Amino acids are polymeric units of:
(A) Glucose
(B) Starch
(C) Protein
(D) Fat
View Answer...
Explanation: Amino acids are the basic building blocks (polymeric units) of proteins.
60. Rice–water turns blue–black with iodine, indicating presence of –
(a) Fat
(b) Complex protein
(c) Starch
(d) Simple protein
View Answer...
Explanation: Starch is a carbohydrate heavily present in rice. When iodine comes into contact with starch, it changes to dark blue-black.
61. In anaerobic respiration in yeast, which are correct?
I: No oxygen present
II: CO₂ produced
III: Energy produced
IV: Lactic acid produced
(a)I, II
(b) II, III, IV
(c) I, II, III
(d) IV
View Answer...
Explanation: Anaerobic respiration (in yeast) is the breakdown of food without oxygen(I) , it breaks down glucose into ethanol, carbon dioxide (II), and a small amount of energy (III). Lactic acid (IV) is only produced in animal muscle cells during heavy exercise, not in yeast.
62. Emulsification of fat molecule is carried out by:
(A) Trypsin
(B) Pepsin
(C) Bile salts
(D) Amylase
View Answer...
Explanation:- Bile salt breaks down large fat molecules into tiny bubbles (globules) to help enzymes work better; this is called emulsification.
63. Which of the equation shows the correct conversion of CO₂ and H₂O into carbohydrates in plants?
(A) 6CO₂ + 6H₂O + Heat Energy → C₆H₁₂O₆ + 6O₂ + 12H₂O (with Chlorophyll)
(B) 6CO₂ + 6H₂O → CH₂O + 6O₂ + 12H₂O (with Sunlight and Chlorophyll)
(C) 6CO₂ + 12H₂O + Heat Energy → C₆H₁₂O₆ + 6O₂ + 6H₂O (with Chlorophyll)
(D) 6CO₂ + 12H₂O + Sunlight → C₆H₁₂O₆ + 6O₂ + 6H₂O (with Chlorophyll)
View Answer...
64. Excess carbohydrates of plants are stored in cell is:
(A) Starch
(B) Glucose
(C) Glycogen
(D) Fats
View Answer...
Explanation: Plants make plenty of glucose during the day via photosynthesis. Excess carbohydrates (glucose) of plants are stored in cell is as starch inside their cells for later use.
65. Steps for starch test on green leaf:
a) Boil leaf in alcohol
b) Boil leaf in water
c) Dip in iodine solution
d) Wash leaf in water
Correct sequence:
(A) a d b c
(B) d a b c
(C) b d a c
(D) b a d c
View Answer...
66. Assertion (A): During daytime, amount of CO₂ released by plants negligible.
Reason (R): CO₂ produced in respiration is used in photosynthesis.
(A) Both correct and R explains A
(B) A correct but R false
(C) A false but R correct
(D) Both false
View Answer...
67. Energy is stored in plants and human body respectively as:
(a) Starch and glycogen
(b) Glycogen and starch
(c) Starch and Glucose
(d) Glycogen and ATP
View Answer...
68. Which of the following is NOT a protein synthesizing enzyme?
(a) Trypsin
(b) Lipase
(c) Mucus
(d) Pepsin
View Answer...
Explanation: Trypsin and Pepsin are protein-digesting enzymes. Lipase breaks down fats, and Mucus is a protective slimy layer, not an enzyme.
69. Blood clotting is related to:
(a) Haemoglobin
(b) Lymph
(c) Platelets
(d) Red blood cell
View Answer...
70. Mode of nutrition where organism derives food from another living organism without harming it:
(A) Parasitic nutrition
(B) Saprophytic nutrition
(C) Autotrophic nutrition
(a) Only A
(b) A and B
(c) Only C
(d) B and C
View Answer...
Explanation: Parasites (like leeches, ticks, or lice) feed directly from a host organism without killing it. Saprophytes feed on dead things, and autotrophs make their own food.
71. If salivary amylase is lacking, which event is affected?
(a) Proteins breaking down into amino acids
(b) Absorption of vitamins
(c) Starch breaking down into sugars
(d) Fats breaking down into fatty acids and glycerol
View Answer...
72. During respiration, gas exchange takes place in—
(a) Trachea and Larynx
(b) Alveoli of lungs
(c) Pharynx and Larynx
(d) Bronchi and Trachea
View Answer...
Explanation: The actual exchange of gases (oxygen crossing into the blood and carbon dioxide moving out) happens exclusively in the ultra-thin alveoli (air sacs) inside the lungs.
73. Thinnest blood vessels are:
(a) Arteries
(b) Veins
(c) Blood Capillaries
(d) Pulmonary artery
View Answer...
Explanation: Capillaries are ultra-thin, microscopic blood vessels. They connect arteries to veins and where the actual exchange of material between blood and cells occurs.
74. During muscle cramps which of the following accumulates in our muscles?
(a) Carbon dioxide
(b) Alcohol
(c) Lactose
(d) Lactic Acid
View Answer...
75. Digestion of food starts from which organ of the digestive system?
(a) Mouth due to the presence of saliva
(b) Oesophagus that moves the food in gut
(c) That releases juices for fat break down
(d) Which helps in mixing food with digestive juices
View Answer...
76. An athlete after a long break of his routine exercise, suffered muscular cramps during a heavy exercise session. This happened due to:
(A) Lack of carbon dioxide and formation of pyruvate
(B) Presence of oxygen and formation of ethanol
(C) Lack of oxygen and formation of lactic acid
(D) Lack of oxygen and formation of carbon dioxide
View Answer...
77. A person is suffering from Hypertension. In Sphygmomanometer his reading is:
(A) 120/80
(B) 110/60
(C) 120/75
(D) 140/90
View Answer...
Explanation: Normal adult blood pressure is roughly 120/80 mm of Hg. Hypertension is the medical term for high blood pressure. A high reading like 140/90 mm of Hg or above clearly indicates hypertension.
78. What is the process by which cells break down nutrients using oxygen to gain energy?
(A) Respiration
(B) Photosynthesis
(C) Endocytosis
(D) Exocytosis
View Answer...
79. Which of the following statements about aerobic respiration is correct?
(A) It occurs in the absence of O₂
(B) It produces more ATP than anaerobic respiration
(C) It occurs only in cells of animals
(D) It produces lactic acid after breaking down of glucose
View Answer...
Explanation: In aerobic respiration, glucose is broken down in the presence of oxygen (O₂). This process releases a large amount of energy and produces more ATP than anaerobic respiration.
80. Assertion: Saliva contains pepsin enzyme.
Reason: Pepsin digests starch into simple sugar.
(A) Both correct and R explains A
(B) A correct but R false
(C) A false but R correct
(D) Both false
View Answer...
81. The autotrophic mode of nutrition requires –
(A) Carbon dioxide and water
(B) Chlorophyll
(C) Sunlight
(D) All of the above
View Answer...
82. The process of acquiring oxygen from outside the body and using it in breakdown of food for cellular needs is called –
(A) Nutrition
(B) Transportation
(C) Excretion
(D) Respiration
View Answer...
83. Which one is the site of complete digestion of carbohydrates, proteins and fats in our body?
(A) Stomach
(B) Mouth cavity
(C) Small intestine
(D) Large intestine
View Answer...
84. The cup-shaped end of a nephron is called –
(A) Glomerulus
(B) Collecting duct
(C) Ureter
(D) Bowman’s capsule
View Answer...
85. Which enzyme is responsible for the conversion of starch into maltose in human digestion?
(a) Amylase
(b) Lipase
(c) Pepsin
(d) Trypsin
View Answer...
86. Blood vessel which carries blood back to heart from the body is –
(a) Artery
(b) Vein
(c) Capillary
(d) Nerve
View Answer...
Explanation:
Veins carry blood back to the heart from different parts of the body.
Arteries carry blood away from the heart.
Veins carry blood toward the heart.
Capillaries are tiny blood vessels that connect arteries and veins.
Nerves are not blood vessels.