ChaseDream

标题: prep cr-64 [打印本页]

作者: wakesleep2011 时间: 2011-4-29 18:53
标题: prep cr-64
同上

作者: wakesleep2011 时间: 2011-4-29 18:54

Adult female rats who have never before encountered rat pups will start to show maternal behaviors after being confined with a pup for about seven days.This period can be considerably shortened by disabling the female's sense of smell or by removing the scent-producing glands of the pup.

Which of the following hypotheses best explains the contrast described above?

(A) The sense of smell in adult female rats is more acute than that in rat pups.

(B) The amount of scent produced by rat pups increases when they are in the presence of a female rat that did not bear them.

(C) Female rats that have given birth are more affected by olfactory cues than are female rats that have never given birth.

(D) A female rat that has given birth shows maternal behavior toward rat pups that she did not bear more quickly than does a female rat that has never given birth.

(E) The development of a female rat's maternal interest in a rat pup that she did not bear is inhibited by the odor of the pup.
这题索性看不懂。。。大牛指教。。。。

作者: wren19891223 时间: 2011-4-30 09:29
E 吧 ordor 引起 maternal behavior

作者: anniecomet 时间: 2011-4-30 16:38
没生过娃儿的母老鼠和老鼠娃儿放在一起，母老鼠的母性要在七天后才表现出来，如果把母老鼠的嗅觉破坏或者让老鼠娃儿不散发出味道，母老鼠的母性能在更短的时间内表现出来

E。解释：因为母老鼠闻到老鼠娃儿的味道会导致母性延迟爆发

欢迎光临 ChaseDream (https://forum.chasedream.com/)