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Question
Given below is an experimental setup to demonstrate a particular tropic movement in germinating seeds. Study the diagram and answer the questions that follow:
- Label the parts 1 and 2.
- Name the tropic movement shown by part 1.
- Part 1 is affected by two stimuli. Name them. Which one of the two is stronger?
- What is thigmotropism? Give one example.
- What is meant by 'Positive' and 'Negative' tropic movements in plants?
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Solution
- The tropic movement shown in part 1 is Hydrotropism.
- Part 1 is affected by gravity and water(moisture); water is stronger.
- The growth movement of plant parts in response to a touch stimulus is called Thigmotropism. Example: Plants such as Sweet Peas, Cuscuta and vines have tendrils that coil around other plants or other available support in response to one-sided contact or touch.
- Directional movement of a plant part towards the stimulus is called positive tropic movement, and away from the stimulus is called negative tropic movement.
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