Q22 of 62 Page 191

Give the role of following: (a) Medulla oblongata (b) Cerebellum.

(a) Medulla oblongata- It controls involuntary action like blood pressure, salivation, vomiting etc.

(b) Cerebellum- This is a part of hindbrain which is responsible for the voluntary actions that we do very precisely. For example- when we walk in a straight line.


This part also controls posture and balance of the body.


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What is phototropism? Describe an activity to demonstrate phototropism.

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Give differences between: (a) Involuntary action and reflex action. (b) Tropic movements and Nastic movements.

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What are phytohormones? Give examples of these hormones and at least one function.

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What is meant by the following: (a) Feedback mechanism (b) Geotropism (c) Thigmotropism?