本题目来源于试卷: Interaction & Interdependence C.6 Integration of Body Systems，类别为 IB生物学
[单选题]
Plant shoots detect anda8 1n2ws( w*zwi 1zmyjk y+mm. respond to light. What plhd0xxxc79. ai ant protein detects light, and what mechanism initiates the xx7h cd.x0a9iresponse?
A. Protein is Auxin ; Mechanism is Triggers movement of phototropins
B. Protein is Auxin ; Mechanism is Inhibits cell elongation
C. Protein is Phototropins ; Mechanism is Triggers movement of auxin
D. Protein is Phototropins ; Mechanism is Stimulates cell elongation
参考答案: C
本题详细解析:
Explanation: Phototropins are molecules in plants that respond to light. When phototropins are stimulated by changes in light activity, they trigger the movement of auxin via active transport. Auxin is moved so that it accumulates in cells on the shady side of the shoot. In these cells, auxin stimulates elongation, allowing the shoot to bend in the direction of the light. Phototropins trigger the movement of auxin, rather than auxin triggering the movement of phototropins (Choice A). In the shoots, auxin stimulates cell elongation rather than inhibiting cell elongation (Choice B). Phototropins work by triggering the movement of auxin rather than directly stimulating cell elongation (Choice D).
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