Question

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 parts A and B of the plant acquired new positions as shown in Figure (ii).

1. Name the phenomenon exhibited by the position of plant parts A and B in Figure (ii).
2. Name the stimulus (other than sunlight) which causes plant part A to grow and bend upwards, and plant part B to bend downwards.

Answer 1

1. The phenomenon exhibited by the positions of plant parts A and B is geotropism.
2. The stimulus which causes plant part A to grow and bend upwards and part B to bend downwards is gravity.