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Why is the Closing of a Dandelion Flower at Dusk (When It Gets Dark) Not a Tropism? - Science

Why is the closing of a dandelion flower at dusk (when it gets dark) not a tropism?

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Solution

The closing of a dandelion flower at dusk is not a tropism because it is a non-directional movement in response to the intensity of light. On the contrary, tropic movement is the movement of plant parts towards the light. It does not depend upon the intensity of light.

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APPEARS IN

Lakhmir Singh Class 10 Biology (Science)
Chapter 2 Control and Coordination
Q 32 | Page 94
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