A potted plant having straight parts A and B was placed horizontally on its side as shown in figure (i). After a few days it was observed that the parts A and B of the plant acquire new positions as shown in Figure (ii).
(a) Name the phenomenon exhibited by the position of plant parts A and B in Figure (ii)
(b) Name the stimulus (other than sunlight) which causes plant part A to grow and bend upwards, and plant part B to bend downwards.

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Solution

(a) The phenomenon exhibited by the positions of plant part A is phototropism and plant part B is geotropism.
(b) The stimulus which causes plant part A to grow and bend upwards is light and part B to bend downwards is gravity.

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(a) The phenomenon exhibited by the positions of plant part A is phototropism and plant part B is geotropism. (b) The stimulus which causes plant part A to grow and bend upwards is light and part B to bend downwards is gravity.

(a) The phenomenon exhibited by the positions of plant part A is phototropism and plant part B is geotropism.
(b) The stimulus which causes plant part A to grow and bend upwards is light and part B to bend downwards is gravity.