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标题: 求助一道归纳题 [打印本页]
作者: 何小媛159753 时间: 2011-7-30 11:26
标题: 求助一道归纳题
When a caterpillar emerges from the egg on a tree branch, it immediately climbs upward until it finds a leaf bud to eat.Biologists thought that this behavior displayed an innate tendency to move in the direction opposite to the pull of gravity.In a recent experiment, a strong light source was placed at the bottom of a tree, and caterpillars, after hatching, climbed downward.
Which of the following hypotheses is best supported by the statements given?
(A) Caterpillars have an innate tendency to move in the direction of gravity.
(B) Newly hatched caterpillars are unable to see in the dark.
(C) Newly hatched caterpillars move towards the strongest light source in the environment.
(D) Newly hatched caterpillars move toward the leaf bud nearest to them.
(E) The eyes of newly hatched caterpillars become less sensitive to light over time.
作者: cyx3271 时间: 2011-7-30 13:02
C 毛毛虫刚刚hatch 之后 会向上爬 专家认为是重力因素导致
然而 后来发现 下面有光源的时候 毛毛虫会响下爬， 因此 否定之前之前专家猜测--由重力导致， 而是由于 毛毛虫向光亮的地方爬
作者: 何小媛159753 时间: 2011-7-30 13:52
C 毛毛虫刚刚hatch 之后 会向上爬 专家认为是重力因素导致
然而 后来发现 下面有光源的时候 毛毛虫会响下爬， 因此 否定之前之前专家猜测--由重力导致， 而是由于 毛毛虫向光亮的地方爬
-- by 会员 cyx3271 (2011/7/30 13:02:55)
但是这之前它向幼虫爬，又怎么解释呢
作者: cyx3271 时间: 2011-7-30 14:47
有可能是 白天上面光线比较强呢 这个原因就不用纠结啦 题干足以推出选项啦
作者: 何小媛159753 时间: 2011-7-30 14:49
好的，非常感谢~
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