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?

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Solution

(a) Figure 2 shows the correct position taken by the parts A and B of a plant.

(b) Geotropism is the phenomenon which is exhibited in this figure. Roots of a plant show positive geotropism, whereas stems show negative geotropism.

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Similar questions

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 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.

Q. A potted plant is made to lie horizontally on the ground. Which part of the plant will show
(i) positive geotropism (ii) negative geotropism?

Q. A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours.
Draw a neat diagram of a chloroplast and label its parts.

Q. A leaf of destarched healthy potted plant was covered by black paper strip as shown in Figure I, and kept in sunlight in the morning. In the evening, it was plucked off and tested for the presence of starch by using iodine solution.

The observation is matched with the Figure No.:
(1) II
(2) III
(3) IV
(4) V

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(a) Figure 2 shows the correct position taken by the parts A and B of a plant. (b) Geotropism is the phenomenon which is exhibited in this figure. Roots of a plant show positive geotropism, whereas stems show negative geotropism.

(a) Figure 2 shows the correct position taken by the parts A and B of a plant.

(b) Geotropism is the phenomenon which is exhibited in this figure. Roots of a plant show positive geotropism, whereas stems show negative geotropism.