You Illuminate One Side of a Plant, but Then Dose

question 143

Multiple Choice

You illuminate one side of a plant, but then dose the whole plant with high levels of ethylene. Does the stem still bend toward the light?

• A)No, ethylene suppresses elongation, and so would override the effect of higher auxin on the shaded cells.
• B)No, ethylene suppresses elongation, and so would override the effects of higher auxin on the illuminated cells.
• C)Yes, because even though ethylene suppresses elongation on both sides equally, higher auxin would lead to larger cells on the shaded side.
• D)Yes, because even though ethylene promotes elongation on both sides equally, higher auxin would lead to larger cell sizes on the illuminated side.

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