Question
Mention the difference between a tactic and nastic movements.
Answer
| Tactic Movement | Nastic Movement |
|---|---|
| Movement in response to a stimulus towards or away from the source of the stimulus. | Rapid, reversible movement in response to the magnitude or intensity of the stimulus. |
| Directional, with movement towards or away from the source of the stimulus. | Non-directional, with movement not dependent on the direction of the stimulus. |
| Chemotaxis in bacteria, phototaxis in Euglena. | Leaf folding in response to temperature, closure of petals in response to touch or changes in light. |
