Which of the following plant movements is due solely to an external stimulus?
A) Helical (spiraling) movement
B) Nodding movement
C) Twining movement
D) Gravitropism
E) None of these answers are correct

Question

Quizplus · Accepted Answer

Gravitropism is the only movement listed that is solely due to an external stimulus – gravity. Helical movement, nodding movement, and twining movement are all due to a combination of internal growth processes and external stimuli.

Which of the Following Plant Movements Is Due Solely to an External