How is the epidermis modified to perform various functions in the following? a) Desert plants b) aerial parts of plants c) exchange of gases d) roots
For class 9th
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a) In desert plants, outer walls of epidermis are usually thick and covered with organic substances like cutin. The thick cutinized wall greatly reduces loss of water by transpiration.
b) Epidermal cells of aerial parts of plants secrete a waxy and water resistant layer on their outer surface. It protects them against loss of water, mechanical injury and any attack by pathogenic fungi.
c) The epidermis of leaves of plants contain small pores called stomata which helps in exchange of gases with the atmosphere. Stomata also helps 8n the process of transpiration i.e. loss of water from leaves in the form of water vapour.
d) The epidermal cells of roots contain long hair like structures called root hairs. The root hairs increase surface area for absorption of water and nutrients from soil.
b) Epidermal cells of aerial parts of plants secrete a waxy and water resistant layer on their outer surface. It protects them against loss of water, mechanical injury and any attack by pathogenic fungi.
c) The epidermis of leaves of plants contain small pores called stomata which helps in exchange of gases with the atmosphere. Stomata also helps 8n the process of transpiration i.e. loss of water from leaves in the form of water vapour.
d) The epidermal cells of roots contain long hair like structures called root hairs. The root hairs increase surface area for absorption of water and nutrients from soil.
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