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Question

When we touch the leaves of a touch-me-not plant, they begin to fold up and droop. When a seed germinates, the root goes down, the stem comes up into the air. What kind of movement is depicted in the first case and the second case respectively?


A

dependent on growth, independent of growth

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B

independent of growth, dependent on growth

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C

directional movement, independent of direction

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D

independent of touch, dependent on touch

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Solution

The correct option is B

independent of growth, dependent on growth


The leaves of the touch-me-not plant move very quickly in response to touch. There is no growth involved in this movement. Hence the movement of the 'former' is independent of growth.

On the other hand, the directional movement of a seedling is caused by growth. If it is prevented from growing, it will not show any movement. Hence the movement of the 'latter' is dependent on growth.


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