Question

diff b/w nastic and tropic movement.​

Answer 1

Nastic movements differ from tropic movements in that the direction of tropic responses depends on the direction of the stimulus, whereas the direction of nastic movements is independent of the stimulus's position. The tropic movement is growth movement but nastic movement may or may not be growth movement.

Answer 2

tropic movement

Plant movements do exist. Plant use movements as an adaptation to escape or minimize injury from harmful external factors or move towards scarce resource or otherwise secure food. For example, the primary root moves downward where it can obtain water and mineral nutrients from deep down while the shoot moves upward to be exposed to light from the sun.

Other examples of plant movements include:

Certain flowers close at night to prevent chilling injury.

Closing and opening of stomata as a mechanism to regulate photosynthesis and transpiration under various environmental conditions.

Carnivorous plants exhibit movement to trap insects which are to become sources of nutrition

Nastic movement..

plant movements that occur in response to environmental stimuli but unlike tropic movements, the direction of the response is not dependent on the direction of stimulus. Some examples of Nastic movements include the closing of the carnivorous Venus flytrap leaf when it captures prey or the folding of the mimosa leaf when it is disturbed. Different types of nastic movements include: