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]
Which of the following + bej w59zk y0tv30rextf*3 g*x8lpj,e 1 ujfxlxb5m- is a function of auxin efflux pumps?
A. To move auxin upwards in a stem
B. To move auxin to the shaded side of a stem
C. To move auxin to the sunny side of a stem
D. To move auxin into flowers
参考答案: B
本题详细解析:
Explanation: Choice B is correct because in phototropism auxin efflux pumps move auxin to the shady side of the stem, which stimulates growth and results in the bending of the stem towards the light source. Choice A is incorrect because auxin moves downwards in stems. Choice C is incorrect because auxin efflux pumps move auxin to the shady side of a stem. Choice D is incorrect because auxin does not move into flowers.
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