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) Figure 2 shows the correct position taken by the parts A and B of a plant.
The root of a plant shows positive geotropism, that means it moves downwards in the soil. The stimulus is gravity.
On the other hand, the stem of a plant shows positive phototropism, that means it moves upward toward the light. The stimulus is light.
Hence, Figure 2 shows the correct position.
(b) The phenomenon exhibited by the figure chosen in (a) is geotropism. Roots of a plant show positive geotropism, whereas stems show negative geotropism but positive phototropism.
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