Evidence for Phototropism Due to the Asymmetric Distribution of Auxin

question 104

Multiple Choice

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

• A) was first demonstrated in the coleoptiles of monocots.
• 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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