(a) What does a plant root do in response to water? What is this phenomenon known as?
(b) What happens to the moonflower (i) during daytime, and (ii) at night? What is this phenomenon known as?

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Solution

(a) A plant root always moves towards water. This phenomenon is known as positive hydrotropism.
(b) (i) Petals of a moonflower close during the day. (ii) They open during the night.
This phenomenon is known as photonasty.

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