HORTICULTURE

Detailed explanation-1: -Nastic movements are 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 the stimulus.

Detailed explanation-2: -Some of the most spectacular plant movements are nastic movements. These include the closing of the carnivorous Venus Flytrap leaf when it captures prey or the folding of the mimosa leaf when it is disturbed.

Detailed explanation-3: -The “trap” is made of two hinged lobes at the end of each leaf. On the inner surfaces of the lobes are hair-like projections called trichomes that cause the lobes to snap shut when prey comes in contact with them. This type of movement is called thigmonasty-a nondirectional plant response to being touched.

Detailed explanation-4: -Thus, we see that the tropic movements are directional and growth-dependent while the nastic movements are non-directional and may or may not be growth-dependent.

Detailed explanation-5: -The movement of plant due to touch is called Nastic Movements. These are non directional movements which takes place neither towards nor away from the stimulus.