试题与答案

小华发现萝卜埋在地下的部分是白色的,露出地面的部分却发绿。经仔细观察,他又发现大

题型:探究题

题目:

小华发现萝卜埋在地下的部分是白色的,露出地面的部分却发绿。经仔细观察,他又发现大葱、蒜苗和韭菜也是这样。这是为什么呢?小华猜想叶绿素的形成可能与光有关。于是,他想用家里的蒜瓣设计一个小实验来证明自己的猜想。(7分)

(1)针对小华的疑问,应该提出的假设是                             

(2)小华将一些蒜瓣分别泡在甲、乙两个装有水的瓷盘中,两盘中蒜瓣的数量应           。然后把甲盘放在阳光下,乙盘放在完全密封的纸箱中,其他条件                      

(3)根据假设可以预测:甲盘中长出的蒜苗叶是      色的,而乙盘中长出的是               色的。

(4)在这个设计中,实验变量是                        

(5)根据预测结果,结论应是                                        

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B

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   _______________________________________________________________

2. How does Mrs. Fang help Ann do?

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