A potted plant having straight parts A and B were 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 parts 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 parts A and B is geotropism.
(b) The stimulus which causes plant part A to grow and bend upwards and part B to bend downwards is gravity.

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Similar questions

A potted plant is kept horizontally for a considerable time. The three positions of the parts A and B of the potted plant are shown in the following figures:

(a) Which figure shows the correct position taken by the parts A and B of the plant?

(b) What type of phenomenon is exhibited by the figure chosen in (A) above?

Q. A potted plant is kept horizontally for a considerable time. The three positions of the parts A and B of the potted plant are shown in the following figures :

(a) Which figure shows the correct position taken by the parts A and B of the plant?
(b) What type of phenomenon is exhibited by the figure chosen in (a) above?

A potted plant is growing in a transparent glass jar. In this plant, X and Y are the two growing parts having a lot of meristematic tissue. It is observed that the part X of this plant exhibits positive geotropism but negative phototropism. On the other hand, part Y of this plant exhibits negative geotropism but positive phototropism.
(a) Name the part X of plant.
(b) Name the part Y of plant.
(c) Which part of the plant, X or Y, will exhibit positive hydrotropism?
(d) Which part of the plant, X or Y, can have tendrils on it?
(e) Which phytohormone causes the part X to exhibit negative phototropism?

Q. A student placed a potted plant growing in a glass pot horizontally (with the root and shoot, both being in the horizontal direction). After a few days, the student observed that the root of the plant bends downwards and the shoot (stem) of the plant bends upwards. Which scientific term is used to indicate:
(a) upward bending of shoot (or stem)?
(b) downward bending of root?

Q. A student takes a potted plant growing in a transparent glass jar. This potted plant having straight stem and straight root is kept near the window in a dark room so that sunlight falls on it from the right side (through the window). After some days, it is found that the stem of plant bends towards the right side (from where the light is coming) but the root bends to the left side, away from the light.
(a) What term is used to indicate:
(i) response of plant to sunlight?
(ii) bending of stem of plant towards sunlight?
(iii) bending of root of plant away from sunlight?
(b) Name the plant hormone which makes the plant respond to sunlight.

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

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