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प्रश्न
Some plants like pea plants have tendrils which help them to climb up other plants. Explain how is it done. Name the plant hormone responsible for this movement.
उत्तर
A tendril is a short stem- or petiole-like structure utilised by vines and climbing plants to wrap around or hook a support. Auxin is a growth hormone that is often synthesised near the shoot tip. It promotes cell development, allowing plants to grow longer. When the tendril comes into touch with any support system, auxin stimulates the cell on the opposite side to grow faster, causing the tendril to form a coil around the support.
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संबंधित प्रश्न
Name the plant part which bends towards light but away from the force of gravity.
What is meant by positive phototropism and negative phototropism? Give one example of each type.
One of the following is not caused by the growth related movement of the concerned plant part. This is:
Differentiate between:
Thigmotropism and geotropism
How is movement in plants different from that in animals?
The venus flytrap plants are examples of ______.
When the leaves of a sensitive plant are touched with a finger, they fold up, and when the light fades at dusk the petals of a sunflower. These two plants show ______ and ______ movements.
The petals of the moon flower open up in the morning and close in the evening. This is called photo nasty.
Assertion (A): If the plant part moves in the direction of gravity, it is called positive geotropism.
Reason (R): Stem shows positive geotropism.
Study the diagrams given below and answer the following questions:
- Name the structures shown as X and Y in the figures (A) and (B), respectively.
- Write the functions performed by the structures X and Y.
- Name the phenomenon depicted and define it.
- How do the structures X and Y differ from each other?
- Give examples of the plants which show the said phenomenon.
