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Question

Question 22:

Light plays an important role in the life of all organisms. Name any three physiological processes in plants which are affected by light.

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Solution

(i) Photosynthesis- It is a totally a light dependent process. Both quality and quantity affect the rate of the process resulting into total biomass accumulation by plants.
(ii) Transpiration -It is loss of water by plant surface. Presence of light increases the temperature, thus affecting the rate of transpiration in plants.
(iii) Flowering The duration of light on plants effects the growth and development of plants. e.g., particularly flowering and this phenomenon is known as photo periodism. On the basis of photoperiodic response, day- flowering plants are categorised as long day, short day and day neutral plants.


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