Question

What is the type of movement that occurs during opening and closing of flowers?

• A. Nastic movement
• B. Tactic movement
• C. Tropic movement
• D. Nutation

Answer 1

The correct option is A Nastic movement

Nastic movements are responses of plant parts to stimuli. Epinasty is the downward bending of a leaf resulting from greater growth of the upper side than of the lower side. Due to more growth on the upper side, the flower will open. The hyponasty is an upward bending or uncoiling of leaves resulting from greater growth of the lower side. Due to more growth on the lower side, the flower will close. Tactic movements are response of plant parts to external stimuli like light, chemicals. Tropic movements are response of plant parts to external stimuli like gravity, light, touch. 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 A.