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题型:实验探究题 题类:模拟题 难易度:容易

2016年福建省厦门九中中考生物模拟试卷

家庭制作酸奶的一般步骤可简要概括为:A.新鲜的全脂或脱脂乳和糖混合→B.煮沸→C.冷却→D.加入一些购买的酸奶→E.发酵(放在室内温暖的地方数小时)→F.可食用

注意事项是:容器要事先消毒灭菌,发酵时要将容器加盖密封。

请你结合自己制作酸奶或甜酒的经验,回答下列问题:

(1)、B步骤“煮沸”的目的是

(2)、D步骤“加入一些购买的酸奶”的原因是

(3)、注意事项“发酵时要将容器加盖密封”的目的是

举一反三
选取三枝同一植物的长势相同的枝条分别标记为A、B、C, 作如下表的处理后,分别插入相同大小的、盛有等量蒸馏水的量筒中,并以石蜡油覆盖密封水面,置于适宜环境条件下。2小时后观察记录各组量筒中蒸馏水的减少量(说明:涂抹凡士林能堵塞叶片相应部位气体进出的通道)。请回答下列问题:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 

枝条编号

枝条处理

蒸馏水减少量

A

不作任何处理

2mL

B

凡士林涂抹所有叶片下表面

0.5 mL

C

除去枝条上的所有叶片

0 mL

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