Question
Write three differences between tactic tropic and nastic movement.
Answer
| Aspect | Tactic Movement | Tropic Movement | Nastic Movement |
|---|---|---|---|
| Direction of Response | Tactic movements are directional, responding towards the stimulus. | Tropic movements are directional, responding towards the stimulus. | Nastic movements are non-directional, lacking a specific orientation. |
| Sensory Perception Mechanism | Tactic movements typically involve specific sensory organs or structures that perceive the stimulus directly. | Tropic movements also involve specific sensory organs or structures that perceive the stimulus directly. | Nastic movements often rely on general perception by the plant and do not necessarily involve specialized sensory organs. |
| Examples | An example of tactic movement is geotropism, where plant roots grow towards gravity. | An example of tropic movement is phototropism, where plant stems bend towards a light source. | Examples of nastic movements include thigmonasty, such as the closing of Mimosa pudica leaves when touched, or nyctinasty, where some flowers open and close in response to the daily light-dark cycle. |
