本题目来源于试卷: Continuity and Change D.7 Reproduction，类别为 IB生物学
[单选题]
Which parts of insect-pollinated flowers are adaptations for mutualist-fjg ,e,2mn vrw:d 0pgic relrdr j*6j:2 wb;jug+ p/lv6ngsationships winuj2 g6vdp6: /jrlgr+ wjs;*b th pollinators?
I.
Nectary
II.
Coloured petals
III.
Stigma
A. I only
B. I and II
C. II and III
D. I, II and III
参考答案: B
本题详细解析:
Choice B is correct because insect-pollinated flowers have coloured petals (Statement II) to attract pollinators and a nectary (Statement I) to reward them, whereas all flowers have a stigma (Statement III). Choice A is incorrect because both statements I and II are correct. Choices C and D are incorrect because the stigma is not adapted for a mutualistic relationship with insects. Only the flower benefits from the presence of a stigma.
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