Question

Which movement occurs due to external stimulus?

• A. Tropic
• B. Nastic
• C. Tactic
• D. All of the above

Answer 1

Answer: (D)

All of the above

The external stimulus induces tropic, nastic, and tactic movements.

1. Tropic movement - Biological phenomenon indicating growth or turning movement of a plant, in response to external stimuli.
2. Nastic movements - Non-directional responses in response to external stimulus
3. Tactic movements - It includes phototactic, chemotactic, and thermotactic movements.
   

So, the correct answer is option D.