Tissues

Class 9 Science - Tissues Exercises

1. Define the term “tissue”.

A tissue is a group of similar cells that work together to perform a specific function in the body.

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

Xylem is made up of four types of elements: tracheids, vessels, xylem fibres, and xylem parenchyma.

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

Simple tissues are made up of only one type of similar cells, while complex tissues are made up of different types of cells working together.

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

- Parenchyma: Thin cell walls.
- Collenchyma: Thick at corners.
- Sclerenchyma: Very thick and hard cell walls.

5. What are the functions of the stomata?

Stomata help in the exchange of gases and in the process of transpiration (loss of water vapour) in plants.

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

(Diagram to be added: Striated - striped, Unstriated - spindle-shaped, Cardiac - branched with stripes)

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

Cardiac muscles help in the rhythmic contraction and relaxation of the heart to pump blood throughout the body.

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

- Striated: Long, cylindrical, striped; found in limbs.
- Unstriated: Spindle-shaped, no stripes; found in internal organs like the stomach.
- Cardiac: Branched, striped; found in the heart.

9. Draw a labelled diagram of a neuron.

(Diagram to be added showing dendrites, cell body, axon, nerve endings)

10. Name the following.

(a) Epithelial tissue.
(b) Tendon.
(c) Phloem.
(d) Adipose tissue.
(e) Blood.
(f) Nervous tissue.

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

- Skin: Epithelial tissue
- Bark of tree: Protective tissue (Cork)
- Bone: Connective tissue
- Lining of kidney tubule: Epithelial tissue
- Vascular bundle: Complex tissue (xylem and phloem)

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

Parenchyma tissue is present in soft parts of plants like the cortex, pith, and in leaves.

13. What is the role of epidermis in plants?

The epidermis protects plants from water loss, infection, and mechanical injury.

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

Cork cells are dead with a waxy substance called suberin, making them waterproof and protecting the plant from injury and water loss.

15. Complete the following chart:

(Diagram to be added during webpage design)
Permanent Tissue / \ Simple Complex / | \ Xylem Phloem Parenchyma Collenchyma Sclerenchyma