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Question
What is meant by positive and negative tropic movements in plants? Explain them by giving suitable examples.
Solution
Positive tropic movements in plants:
Directional movement of a plant part towards the stimulus is called positive tropic movement.
Examples:
- Growth of shoots towards light
- Growth of roots towards gravity
- Growth of roots towards water
Negative tropic movements in plants:
Directional movement of a plant part away from the stimulus is called negative tropic movement.
Examples:
- Growth of roots away from light
- Growth of shoots upwards and away from gravity
- Growth of shoots away from water
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