Question

write about protective tissue

Answer 1

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(i) These tissues are usually present in the outermost layer of the plant body such as leaves, stem and roots. It is one cell thick and covered with cutin and protects the underlying tissues present in the plant body.
(ii) As roots and stems grow older with time, tissues at the periphery become cork cells. Cork cells are dead, have no intercellular spaces and the cell walls are heavily thickened by the deposition of suberin. They prevent loss of water.


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Answer 2

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Protective tissue covers the surface of leaves and the living cells of roots and stems.

 Its cells are flattened with their top and bottom surfaces parallel. Example:  The upper and lower epidermis of the leaf. Bark is the outermost covering of stems and roots of woody plants. It consists of cork, which is a dead outermost protective tissue of older stem, cork cambium, cortex and phloem.

Cork cambium develops in the cortex region.
Cork is an external, secondary tissue that is impermeable to water and gases. It acts as a protective tissue as it is composed of the dead cells. It contains a waxy substance which protects the stem against water loss, the invasion of insects into the stem, and prevents infections by bacteria and fungal spores.

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