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Answer 1

Answer:

1. Simple permanent tissues:

• Simple permanent tissue is a group of cells with similar origins, structure, and functions.
• Found in every part of the plant.
• Composed of one type of cells.
• All cells perform the same function
• Photosynthesis, food storage, tissue repair and secretion are the major functions.
• These are the three types: Collenchyma, Parenchyma and Sclerenchyma.

Complex permanent tissues:

• Complex permanent tissue is a group of cells with several types of cells that have the same origin but diverse functions.
• Found in the vascular region of the plant.
• Composed of several types of cells.
• Different types of cells perform different targets.
• Structural support, conduction of water and nutrients, and protection from hydration are major functions.
• There are two types: Xylem and Phloem.

2. Xylem vessels, Tracheids, Xylem Parenchyma and Xylem Fibres are the components of Xylem tissue.

3. Sieve tubes, Companion cells, Phloem Parenchyma and Phloem fibres are the components of Phloem.

4. Xylem tissue conducts water and minerals from the roots to the leaves.

5. The functions of epidermis are:-

• It protects the internal tissue.
• It enables in gaseous trade because of presence of stomata.
• The bulliform cells assist in inroling and unroling of leaves and thus, lessen transpiration.

6. The characteristics of epidermis in desert plants are:-

• The epidermis is formed of single contimous layered cells. It covers without any intercellular space and protects all parts of the plant.
• Small spores, called stomata, are present on the leaf, and help in the exchange of gases and water.
• Epidermal cells of the roots commonly bear long hair-like parts that increase the total absorptive surface area for water absorption.

1. In desert plants, epidermis has a thick waxy coating of cutin, to check water loss.

7. Cuticle, the outer layer or part of an organism that comes in contact with the environment. In many invertebrates the dead, the noncellular cuticle is secreted by the epidermis.

The functions of a cuticle are:-

• It retains moisture.
• It has a waxy outer surface.

8. When a leaf is examined under the microscope, we observe many tiny pores, which are collectively known as stomata. They are the minute openings, generally found in the epidermis of leaves.

The functions of stomata are:-

• It helps in the exchange of gases by opening and closing the pores in the leaves.
• It helps to expel the excess water out from the leaves in the form of water vapour.

9. The process by which cells become progressively more specialized; a normal process through which cells mature.............. Stem cells can, for example, differentiate into secretory cells in the intestine.

10. A cellular plant tissue from which Phloem, xylem, or cork grows by division, resulting (in woody plants) in secondary thickening is called as cambium.

11. Cork is a protective tissue that separates the living cells of the plant from outside environment. The formation of cork in the peridem is the result of the activity of a secondary meristem, the cork cambium, or phellogen.

Explanation:

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