Question

Write a difference between tropism and nastic movement.

Answer 1

1. Tropic movement is the movement of the plant in response to the stimulus.
2. Nastic movement is the movement of the plant independent of the stimulus.

Tropism movement	Nastic movement
1. Tropism movements are a directional response to stimuli arriving from one direction.	1. Nastic movements are non-directional responses to stimuli.
2. Motion that is directional.	2. The direction of the stimulus does not control movements.
3. The plant component moves towards the stimulus (positive tropism). The plant component moves against the stimulus (negative tropism).	3. Touching, temperature, light, and chemicals induce nastic movement.
4. Examples- Geotropism, Phototropism, etc.	4. Examples- Movement of Venus flytrap (Semimonastic movement)