Explain the significance of the following:
Q. Explain the significance of the following:
(a) hair like structures on epidermal cells
(b) epidermis has a thick waxy coating of cutin in desert plants
(c) small pores in epidermis of leaf
(d) numerous layers of epidermis in cactus
(e) presence of a chemical suberin in cork cells.
Ans.
(a) It increases the total absorptive surface area and helps in absorption.
(b) Cutin has a waterproof quality and helps in preventing water loss due to transpiration. It also protects from excessive heat as being shiny layer reflects most of the light falling on it.
(c) Helps in gaseous exchange and transpiration process.
(d) To prevent water loss
(e) Suberin makes cork cells impervious to gases and water.
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