Question

Ques 7: Give reasons:
a) There are no intercellular spaces in epidermal tissue?
b) Epidermis is thick in desert plants
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Answer 1

Answer:

1. As it has to prevent water loss, as well as inhibit invasion of pathogenic microbes. The epidermal tissues serve as the barrier between the external environment and the body. Hence, epidermal tissues have no intercellular spaces.
2. In deserts, water is scarce and saving water is a major step which plants of this region have to undertake. So in many of the desert plants like Yucca, creosote, cactus, etc, the epidermis has a thick waxy coating of cutin.
3. This restricts the loss of water through transpiration. In desert plants, the epidermis has a thick waterproof coating that is not made of suberin, elastin or chondrin.

Explanation:

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Answer 2

Answer:

i) As it has to prevent water loss, as well as inhibit invasion of pathogenic microbes. The epidermal tissues serve as the barrier between the external environment and the body. Hence, epidermal tissues have no intercellular spaces.