Question

The figure given below depicts a kind of tropic movement in plants. Study the same and answer the following questions:

1. What kind of a movement is shown in the figure? Define it.
2. How does this movement differ from geotropism?
3. Name the stimulus responsible for thigmotropism. Give one example of a plant showing thigmotropism.
4. Name one stimulus which gives a positive response for the roots but a negative response for the shoot.
5. Draw a neat and labelled diagram of the part of a plant showing leaf tendril. Name the plant.

Answer 1

1. Phototropism is shown in the figure.
   A plant's bending in a direction of light is a phenomenon known as phototropism.
2. The response to the stimulus of light is known as phototropism, while geotropism is a response to the stimulus of gravity.
3. 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.
4. Gravity
5. Sweet pea plant shows thigmotropism. The labelled diagram showing leaf tendril is given below: