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Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg.If they laid too many eggs in a host egg, the developing wasp larvae would compete with each other to the death for nutrients and space.If too few eggs were laid, portions of the host egg would decay, killing the wasp larvae.

Which of the following conclusions can properly be drawn from the information above?

正确答案: A

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请教OG-175题

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楼主
发表于 2004-6-9 08:00:00 | 只看该作者

请教OG-175题

175. Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg. If they laid too many eggs in a host egg, the developing wasp larvae would compete with each other to the death for nutrients and space. If too few eggs were laid, portions of the host egg would decay, killing the wasp larvae.



Which of the following conclusions can properly be drawn from the information above?
(A) The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp’s egg-laying behavior.
(B) Host insects lack any effective defenses against the form of predation practiced by parasitic wasps.
(C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species.
(D) Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs.
(E) Parasitic wasps use visual clues to calculate the size of a host egg.


答案是A, 没怎么看明白怎么会涉及到size的问题?题目一直强调数量.


请教哪位中文解释一下, 谢谢!


沙发
发表于 2004-6-9 11:58:00 | 只看该作者
寄生黄蜂在其他昆虫卵中产卵,而产卵的数量取决于卵的大小(exactly the right numbers for any suitable size of host egg),如果卵太小产卵数量大,产的卵自相竞争,如果卵太大,而产卵数量小,被寄生的卵就会腐烂,杀死产的卵。
板凳
 楼主| 发表于 2004-6-9 18:48:00 | 只看该作者

还是和数量有关啊.


A为什么对呢

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