Q19 of 63 Page 7

What is hydrotropism?

Hydrotropism is a type of tropism, where the plant shows movement in response to water.

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17 Write name of three hormones secreted by the pituitary gland. 18 Nervous and hormonal system together perform the function of control and coordination in human beings. Justify the statement. 20 What is coordination? 21 Why is the response of a plant to a stimulus not observed immediately?