Q5 of 86 Page 149

Define transpiration.

Transpiration is the process of loss of water in form of water vapour from aerial parts of the plant.

There are three types of transpiration i.e. cuticular- where water is lost from cuticle of leaves, stomatal transpiration- where water is lost from stomata, lenticular transpiration- where water is lost from lenticels.


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3

Differentiate phototropism from photonasty.

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Photosynthesis converts energy X into energy Y.

a) What are X and Y?


b) Green plants are autotrophic in their mode of nutrition. Why?

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Design an experiment to demonstrate hydrotropism.

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The bending of root of a plant in response to water is called __________.