CBSE Class 10 Science 2023 · Paper 31/6/2 · Question 29(a)
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.
Answer
A tendril grows less on the side touching a support, so it coils round the support (thigmotropism); the hormone responsible is auxin.
Tendrils are sensitive to touch. When a tendril comes in contact with a support, such as the stem of another plant, the part of the tendril in contact with the support does not grow as rapidly as the part away from it. Because the far side grows longer than the near side, the tendril bends towards the support, circles round it and clings to it, and the plant climbs. This is a growth movement in response to touch (thigmotropism). The plant hormone responsible is auxin, which makes plant cells grow longer.
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