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)

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Solution

The phenomenon exhibited by part A (stem) and plant part B (root) is geotropism.

The movement of a plant part in response to light is called phototropism. The movement of plant part in response to gravity is called geotropism.

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Q. 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)
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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.
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Q. 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).

(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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The phenomenon exhibited by part A (stem) and plant part B (root) is geotropism. The movement of a plant part in response to light is called phototropism. The movement of plant part in response to gravity is called geotropism.

The phenomenon exhibited by part A (stem) and plant part B (root) is geotropism.

The movement of a plant part in response to light is called phototropism. The movement of plant part in response to gravity is called geotropism.