Question

Opening of floral bud is
(a) Autonomic movement of variation
(b) Paratonoc movement of variation
(c) Autonomic movement of growth
(d) Autonomic movement of locomotion

Answer 1

Hint: Part of the plant cells that divide without any external stimuli which is a spontaneous movement that helps in the growth of plants.

Complete answer:
Autonomic movements of plans are classified into three types namely movement of locomotion, growth and curvature movements, and variations. Growth and curvature movement is further classified into two types: nutation movement and nastic movement. Unequal growth of different sides of organs results in growth and curvature movement. The supporting organs that are in contact with support grow at a slow rate resulting in curvature that helps in twinning or spiraling of the supporting organ around the support. This is called nutation. Faster growth on the surface of the organ and difference in the growth rate results in the movement known as a nastic movement. The opening of a floral bud is an example of the nastic movement of the autonomic movement of growth.

Additional information:
- Movement in plants is of two types namely autonomic movement and induced movement. Autonomic movement is a spontaneous movement and induced movement is a paratonic movement.
- If the movement of the plant takes place spontaneously without any external stimuli. Those movements are called spontaneous movements or autonomous movements.
So, the correct answer is ‘(c) Autonomic movement of growth’.

Note: If the movement of the plant takes with the help of external stimuli without any irritability and sensitivity of protoplasm such movements are called induced movements. They are classified into three types: tropic movements, tactic movements, and nastic movements.