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Question
Which of the following are not tropisms?
(i) growing of pollen tube in response to a sugary substance
(ii) folding up of leaves of sensitive plant in response to touch
(iii) winding of tendril around a support in response to touch
(iv) opening up of the leaves of a daisy flower in response to light
(a) (i) and (ii) (b) (ii) and (iii) (c) (i) and (iv) (d) (ii) and (iv)
Solution
(d) (ii) and (iv)
The folding up of leaves in sensitive plant as a response to touch and the opening up of leaves of a daisy flower in response to light are nastic movements.
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