Question

Choose the correct answer from the alternatives given.
How does auxin actually work?

• A. In the presence of blue light, it triggers additional photosynthesis and growth
• B. In the presence of light, it increases the turgor pressure of the cell and accelerates growth
• C. In the presence of light, it increases the formation of hydrolytic enzymes that release energy needed for growth purposes
• D. In the presence of unidirectional light, it moves to the shady side and activates an ATP-driven proton pump that results in weakened cell wall and eventual elongation

Answer 1

The correct option is D In the presence of unidirectional light, it moves to the shady side and activates an ATP-driven proton pump that results in weakened cell wall and eventual elongation

Auxin is a plant hormone produced in the stem tip that promotes cell elongation. Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant. It then activates an ATP-driven proton pump that results in the weakened cell wall and eventual elongation.

So, the correct option is 'In the presence of unidirectional light, it moves to the shady side and activates an ATP-driven proton pump that results in the weakened cell wall and eventual elongation'.