Multiple choice

Which of the following movements is not caused by growth?

  1. A climbing pea plant

  2. A germinating seed

  3. Drooping leaves of touch–me–not

  4. A shoot bending towards light
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

‘Touch-me-not’ plants are sensitive plants. They do not show growth as they fold up and droop in response to touch. This is because of the reason that when such plants are touched or disturbed, certain specialised cells in the stem become sensitive and release certain chemicals. These chemicals help in removing the water from vacuoles of the cells. As a result of this, water diffuses out of the plant cells, making them shrink.

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