Evidence for Phototropism Due to the Asymmetric Distribution of Auxin

question 110

Multiple Choice

Evidence for phototropism due to the asymmetric distribution of auxin moving down the stem

• A)has not been found in eudicots such as sunflower and radish.
• B)has been found in all monocots and most eudicots.
• C)has been shown to involve only IAA stimulation of cell elongation on the dark side of the stem.
• D)can be demonstrated with unilateral red light, but not blue light.
• E)is now thought by most plant scientists not to involve the shoot tip.

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