Question

What causes Tropic responses?

Answer 1

Tropism:

1. When a plant exhibits some growth movement in response to a stimulus, it is referred to as tropism. Tropism is specific to the direction of the stimulus.
2. These stimuli are unidirectional, but the movement of the plant part is directional.
3. Growth movements that occur in the direction of the stimulus are known as tropic movements.
4. Tropic movements lead to differential growth.

Tropic responses are caused by various factors that include light, gravity, water, and touch.

1. In a blue-light-dependent response, phototropism is regulated by the activity of the particular blue-light photoreceptors referred to as phototropin.
2. Gravitropism is based on the presence of starch-filled plastids, in unique cells.