Question

Movement of plant part in response to touch is

• A. Seismonasty
• B. Thigmonasty
• C. Nutation
• D. None of the above

Answer 1

The correct option is B Thigmonasty

Nastic movements are responses of plant parts to stimuli. Seismonastiy is the nastic response of a plant to touch or vibration. Dropping of leaves of Mimosa pudica upon touching is due to seismonasty. Thigmonasty is the nastic response of a plant to touch. The movements of tentacles of Drosera when comes in contact with insect is due to thigmonasty. Nutation is the bending movements shown by some plant parts due to the unequal rate of growth of different parts of plants.

Thus, the correct answer is option B.