NCERT Solutions for Class 9 Science Chapter 6 Tissues

1. Define the term “tissue”.

Answer: Group of cell having similar structure performing particular function is called tissue.

2. How many types of elements together make up the xylem tissue? Name them.

Answer: Xylem is formed from following cell –

• Tracheids
• Vessels
• Xylem parenchyma
• Xylem fibres

3. How are simple tissues different from complex tissues in plants?

Answer:

Simple Tissues	Complex Tissues
Simple tissues has only one type of cells	Complex tissues are made up of two or more types of cell
All cells perform same similar functions and has similar structures	Different cells perform different functions
Simple tissues are parenchyma, collenchyma, sclerenchyma	Complex tissues in plants are xylem and phloem.

4. Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall.

Answer:

	Parenchyma	Collenchyma	Sclerenchyma
Intercellular spaces	Large	Less	No spaces
Cell (Dead / Alive)	Alive	Alive	Dead
Cell wall	Thin	Irregularly thick	Thick
Functions	Food storage and support Chlorenchyma prepares food during photosynthesis Aerenchyma have air in spaces which allow floating of plants in water	Provides flexibility in plants	Provides rigidity and strength to plants

5. What are the functions of the stomata?

Answer: Following are the functions of stomata-

• Exchange of gases oxygen and carbon dioxide.
• Loss of excess of water through plants by the process of transpiration.

6. Diagrammatically show the difference between the three types of muscle fibres.

Answer:

7. What is the specific function of the cardiac muscle?

Answer: Cardiac muscles are responsible for contraction and relaxation of heart.

8. Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body.

Answer:

Muscle Type	Structure	Location	Function
Striated muscle	Cells are cylindrical, elongated, unbranched, multinucleated Contain light dark band	Present in limbs	Allows voluntary movements
Smooth muscle	Cells are elongated, spindle shape, have single nucleus Does not contain striation	Present in alimentary canal, iris of eye, in ureter, in bronchi of lungs	Allows involuntary movements
Cardiac muscle	Elongated, cylindrical, branched, single nucleus	Heart	Allows continuous contraction and relaxation

9. Draw a labelled diagram of a neuron.

Answer:

Animal Tissue: NErvous Tissue[/caption]

10. Name the following.

(a) Tissue that forms the inner lining of our mouth.

Answer: Epithelial tissue

(b) Tissue that connects muscle to bone in humans.

Answer: Tendons

(c) Tissue that transports food in plants.

Answer: Phloem

(d) Tissue that stores fat in our body.

Answer: Adipose tissue

(e) Connective tissue with a fluid matrix.

Answer: Blood

(f) Tissue present in the brain.

Answer: Nervous tissue

11. Identify the type of tissue in the following: skin, bark of tree, bone, lining of kidney tubule, vascular bundle.

Answer:

• Skin – Squamous epithelial tissue
• Bark of tree – Simple permanent tissue
• Bone – Connective tissue
• Lining of kidney tubule – Cuboidal epithelial tissue
• Vascular bundle – Complex permanent tissue

12. Name the regions in which parenchyma tissue is present.

Answer: Parenchyma is present in leaves, flowers and fruits of the plant.

13. What is the role of epidermis in plants?

Answer: Epidermis is responsible for –

• Protection of plant body from external agents
• Protects plant body from mechanical injury
• Allows exchange of gases through stomata

14. How does the cork act as a protective tissue?

Answer: Cork or bark of tree is its outer protective layer. Cork is made up of dead cells. It protects plants from higher temperatures, winds, mechanical injuries, etc.

15. Complete the following chart:

Answer:

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