Question

Difference between tropic and nastic movements

Answer 1

Answer:

Nastic movements are non directional responses to stimuli such as temperature and heat. ... → Tropic movement is the response to stimuli that comes from one direction. → It is a directional movement. → If the movement of the plant part is towards the stimulus, then it is known as positive tropism .

Tropic movements and Nastic movements are the two types of induced or paratonic movements of curvature in plants. ... Example: phototropic movements (movement towards the light) geotropic movements (movement towards gravity), chemotropic movements (movement towards chemicals) etc.

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Answer 2

ᴛʀᴏᴘɪᴄ ᴍᴏᴠᴇᴍᴇɴᴛs

The paratonic (induced) movement of growth is called tropic movements. Here the stimuli are external and unidirectional.

ɴᴀSᴛɪᴄ ᴍᴏᴠᴇᴍᴇɴᴛS

The paratonic movements of variations are called nastic movements. Here the stimuli are external and diffused (not unidirectional).