CBSE Class 10 Science 2023 · Paper 31/2/2 · Question 30
Explain the directional movement due to growth in response to touch in a pea plant.
Answer
Unequal growth makes a pea tendril bend towards and coil round a support it touches; this growth movement in response to touch is thigmotropism.
Pea plants climb by means of tendrils, which are sensitive to touch. When a tendril comes in contact with a support, the part of the tendril touching the support does not grow as rapidly as the part away from it. Because the far side grows more, the tendril bends towards the support, circles round it and clings to it. The movement is due to growth and its direction is decided by the stimulus, so it is a directional growth (tropic) movement in response to touch, known as thigmotropism; it lets the pea plant climb up a support.
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