A potted plant is kept horizontally for a considerable time. The three positions of the part A and B of the potted plant are shown in the following figures.
(i) Potted plant with shoot and root growing downward. (Diagram to be drawn)

(ii)

(iii) Potted plant with shoot and root growing upward (Diagram to be drawn)

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 by (A) in the figure (ii)?

Question

A potted plant is kept horizontally for a considerable time. The three positions of the part A and B of the potted plant are shown in the following figures.
(i) Potted plant with shoot and root growing downward. (Diagram to be drawn)

(ii)

(iii) Potted plant with shoot and root growing upward (Diagram to be drawn)

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 by (A) in the figure (ii)?

Philoid · Accepted Answer

(a) Fig. ii shows correct position. Because roots are positively geotropic so they bends towards earth’s gravity downwards. Shoots are positively phototropic so they bend towards light i.e. move upwards.

(b) Shoot bends towards light so they exhibit positive phototropism. The movement of plant parts in response to stimulus light is called phototropism and as the shoot bends towards light so it is positive phototropism.