Question

1. which is not a stimulus that can trigger tropisms in plants? a. light b. gravity c. touch d. temperature

Explanation:

Tropisms are directional growth responses of plants to external stimuli. Phototropism (response to light), gravitropism (response to gravity), and thigmotropism (response to touch) are well - known tropisms. There is no major tropism in plants that is specifically and commonly defined as a response to temperature. Temperature can affect plant growth and development in other ways (like influencing metabolic rates), but it is not a typical stimulus for tropisms.

Answer:

D. temperature