Question

Nastic movements differ from tropic movements in being

• A. Directional with respect to stimulus
• B. Non-directional with respect to stimulus
• C. Controlled by turgor pressure
• D. Controlled by chemicals

Answer 1

The correct option is B Non-directional with respect to stimulus

Nastic movements are non-directional responses to stimuli and are usually associated with plants. The movement can be due to changes in turgor or changes in growth. 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.