Question

Pick up the correct answer.
I) In tropic movements, there is a definite relationship between response and stimulus.
II) Stimulus acts on protoplasm from one direction only in tropic movements.
III) In nastic movement, there is no relation between response and direction of stimulus.
IV) Stimulus acts on protoplasm from all sides in nastic movements.

• A. I and II are correct.
• B. I, II and III are correct.
• C. II, III and IV are correct.
• D. All are correct.

Answer 1

The correct option is D All are correct.

In tropic movements, there is a definite relationship between response and stimulus. Stimulus acts on protoplasm from one direction only in tropic movements. In nastic movement, there is no relation between response and direction of stimulus. Stimulus acts on protoplasm from all sides in nastic movements. 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 rate or frequency of these responses increases as intensity of the stimulus increases. An example of such a response is the opening and closing of flowers.