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发布时间：2006-06-23 11:57     点击：

(D) discuss three different types of adaptive responses and provide an example that explains how one of those types of responses works

(E) contrast acclimatory responses with developmental responses and suggest an explanation for the evolutionary purposes of these two responses to changing environmental conditions

15. The passage supplies information to suggest that which one of the following would happen if a pond inhabited by water bugs were to dry up in June?

(A) The number of developmental responses among the water-bug population would decrease.

(B) Both micropterous and macropterous water bugs would show and acclimatory response.

(C) The generation of water bugs to be hatched during the subsequent spring would contain an unusually large number of macropterous individuals.

(D) The dimorphism of the summer generation would enable some individuals to survive.

(E) The dimorphism of the summer generation would be genetically transferred to the next spring generation.

16. It can be inferred from the passage that if the winter months of a particular year were unusually warm, the

(A) eggs formed by water bugs in the autumn would probably produce a higher than usual proportion of macropterous individuals

(B) eggs formed by water bugs in the autumn would probably produce an entire summer generation of water bugs with smaller than normal wings

(C) eggs of the overwintering generation formed in the autumn would not be affected by this temperature change

(D) overwintering generation would not leave the ponds for the forest during the winter

(E) overwintering generation of water bugs would most likely form fewer eggs in the autumn and more in the spring

17. According to the passage, the dimorphic wing structure of the summer generation of water bugs occurs because

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