NCERT Solutions For Class 9 Science Chapter 6 Tissues
In this article, you will find NCERT Solutions for Class 9 Science Chapter 6 Tissues. Whether you’re studying under CBSE or State Board, these solved examples will help you understand and revise all the concepts of this chapter.
Each answer is explained in simple language, so you can learn easily and score better.
NCERT Textbook for Class 9 Science – Page 69
1. What is a tissue?
Answer: A tissue is a group of similar cells that have a similar structure and work together to perform a specific function in the body.
2. What is the utility of tissues in multicellular organisms?
Answer: Tissues in multicellular organisms help in many ways.
- Tissues give structural and mechanical strength to the body.
- They also allow division of labour, where each type of tissue performs a specific function. For example, nerve tissue helps in carrying messages, while muscle tissue helps in movement.
Class 9 Science NCERT Textbook – Page 74
1. Name types of simple tissues.
Answer: The three types of simple tissues in plants are:
- Parenchyma
- Collenchyma
- Sclerenchyma
Whereas, Aerenchyma and chlorenchyma are two types of parenchyma tissue.
2. Where is apical meristem found?
Answer: The apical meristem is found at the tips of roots and shoots in plants.
3. Which tissue makes up the husk of coconut?
Answer: The husk of the coconut is made up of sclerenchyma tissue. It is a permanent tissue with dead cells that have thick, long and narrow cell walls. Their cell walls are thickened because of the presence of lignin.
4. What are the constituents of phloem?
Answer: Phloem is made up of four types of elements, namely-
- Sieve tubes
- Companion cells
- Phloem fibres
- Phloem parenchyma
Class 9 Science NCERT Textbook – Page 78
1. Name the tissue responsible for movement in our body.
Answer: Muscle Tissues are responsible for movement in our body.
2. What does a neuron look like?
Answer:
A neuron is a nerve cell consisting of three main parts:
- Cell body – A cell body contains a nucleus and cytoplasm.
- Dendrites – Dendrites are the short, branched extensions of a neuron that carry messages towards the cell body.
- Axon – Each neuron has single long part called axon that carries messages away from the cell body to other neurons or muscles.
3. Give three features of cardiac muscles.
Answer: Feature of cardiac muscles
- Heart muscles (cardiac muscles) are cylindrical, branched and uninucleated (have a single nucleus).
- They have striated muscle fibres.
They are involuntary muscles, so we cannot control their movement.
4. What are the functions of areolar tissue?
Answer: Areolar connective tissue is found between the skin and muscles, around blood vessels and nerves and in the bone marrow. Functions of Areolar Tissue are-
- Areolar tissue fills spaces between organs and tissues.
- It supports internal organs and keeps them in place.
- It helps in the repair of tissues after injury.
- It binds the skin to muscles beneath it.
Questions From NCERT Textbook for Class 9 Science
1. Define the term “tissue”.
Answer: A tissue is a group of similar cells that have a similar structure and work together to perform a specific function in the body.
2. How many types of elements together make up the xylem tissue? Name them.
Answer:
Xylem tissue is made up of four types of elements. Their names are:
- Tracheids
- Vessels
- Xylem fibres
- Xylem parenchyma
3. How are simple tissues different from complex tissues in plants?
Answer:
| Simple Tissues | Complex Tissues |
|---|---|
| Simple tissues consist of only one type of cells. | Complex tissues consist of more than one type of cells. |
| All cells in simple tissues perform the same function. | Different types of cells in complex tissues perform a common function. |
| Examples of simple tissues are Parenchyma, Collenchyma, and Sclerenchyma. | Examples of complex tissues are Xylem and Phloem. |
4. Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall.
Answer:
| Parenchyma | Collenchyma | Sclerenchyma |
|---|---|---|
| Parenchyma cells have thin cell walls that are loosely packed. | Collenchyma cells have cell walls thickened at the corners and there is very little space between the cells. | Sclerenchyma cells have very thick and rigid cell walls. So, there is no intercellular space. |
| The cell wall is made up of cellulose. | The cell wall is made up of cellulose and pectin. | The cell wall is made up of lignin. |
5. What are the functions of stomata?
Answer:
Stomata are the tiny pores present on the epidermis. Their main functions are:
- Stomata allow exchange of gases between the plant and the atmosphere.
- Stomata help in transpiration (loss of water in the form of water vapour).
6. Diagrammatically show the difference between the three types of muscle fibres.
Answer:
Striated muscles, smooth muscles, and cardiac muscles are the three types of muscular fibres.
Features in the Diagram
Striated muscles
(1) They are connected to bones (Skeletal muscles).
(2) They are voluntary muscles.
(3) The cells are long, cylindrical, unbranched with many nucleus.
Smooth muscles
(1) They are found in alimentary canal, in the iris of the eye, in ureters and in the bronchi of the lungs.
(2) They are involuntary muscles.
(3) The cells are spindle-shaped and have a single nucleus.
Cardiac muscles
(1) They are found in heart.
(2) They are involuntary in action.
(3) The cells are cylindrical, branched and have one nucleus.
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7. What is the specific function of the cardiac muscle?
Answer:
The specific function of the cardiac muscle is to contract and relax rhythmically throughout life. This rhythmic movement helps in the pumping of blood to all parts of the body.
8. Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and location in the body.
Answer:
| Feature | Striated Muscles | Smooth Muscles | Cardiac Muscles |
|---|---|---|---|
| Location | Striated muscles are connected to bones (skeletal muscles). | Smooth muscles are found in the alimentary canal, iris of the eye, ureters, and bronchi of the lungs. | Cardiac muscles are found in the heart. |
| Structure | Striated muscle cells are long, cylindrical, unbranched, and have many nuclei. | Smooth muscle cells are spindle-shaped and have a single nucleus. | Cardiac muscle cells are cylindrical, branched, and have one nucleus. |
9. Draw a labelled diagram of neuron.
Answer:
10. Name the following.
(a) Tissue that forms the inner lining of our mouth.
(b) Tissue that connects muscle to bone in humans.
(c) Tissue that transports food in plants.
(d) Tissue that stores fat in our body.
(e) Connective tissue with a fluid matrix.
(f) Tissue present in the brain.
Answer:
(a) Tissue that forms the inner lining of our mouth – Epithelial tissue ( Squamous epithelium)
(b) Tissue that connects muscle to bone in humans – Tendon
(c) Tissue that transports food in plants – Phloem
(d) Tissue that stores fat in our body – Adipose tissue
(e) Connective tissue with a fluid matrix – Blood
(f) Tissue present in the brain – Nervous tissue
11. Identify the type of tissue in the following: skin, bark of tree, bone, lining of kidney tubule, vascular bundle.
Answer:
- Skin – Stratified squamous epithelium
- Bark of tree – Protective tissue (Cork)
- Bone – Connective tissue
- Lining of kidney tubule – Cuboidal epithelial tissue
- Vascular bundle – Complex permanent tissue (Xylem and Phloem)
12. Name the regions in which parenchyma tissue is present.
Answer:
Parenchyma tissue is found in:
- The pith of roots and stems
- It is found in green leaves (called chlorenchyma)
- Parenchyma found in aquatic plants that has large air cavities (called aerenchyma)
13. What is the role of epidermis in plants?
Answer: Role of the epidermis:
- It protects the plant from physical injury and water loss.
- It prevents the entry of pathogens.
- It helps in gas exchange through stomata.
- It reduces excessive water loss in dry areas using the waxy cutin layer.
14. How does the cork act as a protective tissue?
Answer:
Cork acts as a protective tissue because its cells are dead and tightly packed without any gaps. Their walls have a substance called suberin, which does not allow water or gases to pass through. This helps protect the plant from water loss, infections, and mechanical injuries.
15. Complete the table:
Answer:
