Give reasons for the following:

(i) Bark of a tree is impervious to gases and water.

(ii) In desert plants, epidermis has a thick waxy coating.

(iii) Epidermal cells of the roots generally have hair like parts.

(i) Cells of bark are dead and compactly arranged without intercellular spaces. They have a chemical called suberin in their walls that makes them impervious to gases and water.

(ii) The thick waxy coating on epidermis is of cutin on its outer surface which is a chemical substance with waterproof quality. This helps in protection against loss of water and parasitic fungi.

(iii) Function of epidermal cells in roots is water absorption. Hair like parts greatly increase the total absorptive surface area.

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