Question

Observe the diagram
i) Mention the type of movements
shown in figure A and B.
ii) How does this movement differ from
the movement of mimosa?

Answer 1

A is geotropic movement while B is phototropic movement.

Answer 2

Answer:

(i) The movement shown in figure A is positive geotropism and the movement shown in figure B is negative geotropism.

Positive geotropism is the growth or movement of a plant toward the gravitational pull of the Earth whereas negative geotropism is the growth or movement of a plant away from the gravitational pull of the Earth.

(ii) The movement of leaves of Mimosa pudica is an example of thigmonasty.

Thigmonasty is the movement of a plant on experiencing physical contact. Thigmonasty is non-directional. On the other side, geotropism is the movement or growth of a plant towards or away from the gravitational pull of the Earth. Geotropism is directional.