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Question
The figure given below depicts a kind of tropic movement in plants. Study the same and answer the following questions:
- What kind of a movement is shown in the figure? Define it.
- How does this movement differ from geotropism?
- Name the stimulus responsible for thigmotropism. Give one example of a plant showing thigmotropism.
- Name one stimulus which gives a positive response for the roots but a negative response for the shoot.
- Draw a neat and labelled diagram of the part of a plant showing leaf tendril. Name the plant.
Solution
- Phototropism is shown in the figure.
A plant's bending in a direction of light is a phenomenon known as phototropism. - The response to the stimulus of light is known as phototropism, while geotropism is a response to the stimulus of gravity.
- The stimulus responsible for thymotropism is touch.
Cuscuta and vine tendrils coil around other plants or a support to create a one-sided touch or contact. - Gravity
- Sweet pea plant shows thigmotropism. The labelled diagram showing leaf tendril is given below:
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Give the scientific term for the following:
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Ali has some pea plants in his garden which need a support to grow as seen in the picture given below:
- Name the phenomenon depicted by the shoot in the given figure.
- Define the above phenomenon.
- Write the name of the part marked X.
The growth movement of plant parts which occurs due to touch stimulus is called ______.
Growth of root towards water is ______.
