Question

question 15
which molecule plays that largest role in plant phototropism?
proteins
starches
chlorophyll
auxins

Explanation:

1. Analyze each option:

• Proteins: Involved in various plant functions but not the main molecule for phototropism.
• Starches: Storage molecules, not related to phototropic response.
• Chlorophyll: Involved in photosynthesis, not phototropism.
• Auxins: Plant hormones that regulate growth, and they are responsible for phototropism (plants bending towards light due to auxin redistribution).

Answer:

D. auxins