本题目来源于试卷: Interaction & Interdependence C.8 Populations & Communities，类别为 IB生物学
[单选题]
Which parts of insect-pollinated flowers arx+ecd;ih -uuxe8/m b 4nyb iazu77+h+ xoj :j:g ncq.3e adaptations for mutualistic relationships with pollinato3hjncy+zx:gb jo7: q7.+u nai rs?
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:
Explanation: 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.
| 
