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将一株质量为20g的黄瓜幼苗栽种在光照等适宜的环境中，一段时间后植株达到40g，其增加的质量来自于（ ）
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高三下学期生物《》真题及答案
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在实验室中化学教师将100g氯酸钾和20g二氧化锰的混合物加热制取氧气反应一段时间后停止加热冷却后称
下列生产实践方法中不属于无性生殖的是
将甘薯放在温暖、湿润的环境中培养会长出很多幼苗，可以将它们分别栽植
取一片秋海棠的叶，在背面的叶脉上切口，放在湿润的土壤中培养，叶脉切口处会长出根，叶面会长出芽，最后长成一株新的秋海棠
将玉米种子用温水浸泡，然后播种到地里，一段时间后就可以长成一株玉米
秋天，菊花开过之后，可将地面上的茎秆剪去，保留地下的根。第二年春天，根周围能生出很多幼苗，将它们分别栽种就成了一株株新植物体
简述将一株幼苗种植于花盆中的过程
下列现象不能用质量守恒定律解释的是
将2g氢气在20g氧气中燃烧，生成18g水
将20mL酒精与20mL水混合，总体积小于40mL
将浓硫酸置于空气中一段时间，溶液质量增加
将二氧化碳的水溶液加热，溶液质量减轻
6分某小组在探究环境条件对叶绿素形成的影响的活动中作出的假设是光照能影响叶绿素的形成据此假设该小组设
将一株植物培养在H218O中进行光照过一段时间后18O可能存在于
葡萄糖中
周围的水蒸气中
周围空气中的二氧化碳中
周围空气中的氧气中
将一株植物置于密闭透明的玻璃罩内在适宜的温度光照和充足的矿质养料条件下一段时间后容器中的含量有所下降
合成有机物的速度加快
有机物总量有所增加
呼吸作用有所减慢
吸收水分和矿质离子的速度有所减慢
甲图表示燕麦幼苗生长素浓度与作用的关系乙图表示将一株燕麦幼苗水平放置培养一段时间后的生长情况丙图表示
用两株同样的绿色植物作实验给其中的一株以连续光照给另一株一定频率的间歇光照经过一段时间后测得光合作用
①②
①③
②③
①④
甲图表示燕麦幼苗生长素浓度与作用的关系乙图表示将一株燕麦幼苗水平放置培养一段时间后的生长情况丙图表示
在适宜温度下采用完全营养液培养黄瓜幼苗研究营养液中氧含量变化对K+吸收速率的影响实验结果如下图分析并
把培养在完全营养液中生长状态良好且一致的3组某种植物幼苗分别放入
B.C.三个完全相同的玻璃钟罩内（如下图所示），其中A.不密封，
C.密封；B.内培养皿中盛有Ba(OH)
2
溶液，A.
内培养皿中盛有蒸馏水，各培养皿中液体的体积相同。该实验在光照充足、温度适宜的环境中进行。下列有关叙述正确的是
A.该实验的目的是探究光照、CO2浓度对幼苗光合强度（或生长量）的影响 B.培养一段时间后，预期的实验结果是：B.中的幼苗生长量比C.中的小 C.培养一段时间后，预期的实验结果是：A.中的幼苗生长量比C.中的小
应再增设D.组实验：装置如B.组，在暗处、温度适宜的环境中进行
一棵重10g的植物栽在水分空气温度光照均适宜的环境中一月后重达20g增加的质量主要来自
光照
空气
水分
水分和空气
2008年唐山测试将一株植物培养在H218O中并进行光照过一段时间后18O存在于
光合作用生成的水中
仅在周围的水蒸气中
仅在植物释放的氧气中
植物释放的氧气和周围的水蒸气中
20g的高锰酸钾在试管中加热一段时间后再称剩余固体的质量为19.8ｇ则生成氧气的质量是
19.8ｇ
0.2ｇ
2.0ｇ
不能确定
某研究性学习小组的同学对玉米和小麦进行如下实验将等质量的玉米幼苗和小麦幼苗放在相同的密闭透明的容器中
氯酸钾和二氧化锰的混合物共200g其中钾元素质量分数为19.5%加热一段时间后将所得固体加入足量水搅
96g
50g
48g
20g
甲图表示燕麦幼苗生长素浓度与作用的关系乙图表示将一株燕麦幼苗水平放置培养一段时间后的生长情况丙图表示
玉米幼苗绿色G对白色g为显性将杂合子自交产生的800粒玉米种子随机分成数量相等的两组其中一组种子萌发
3:5
5:3
3:1
1:3
某生物兴趣小组用若干大豆和玉米的种子在适宜条件下进行萌发获得了大量正常生长的幼苗并进行了相关实验研究
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高二下学期生物
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A.该实验的目的是探究光照、CO2浓度对幼苗光合强度（或生长量）的影响 B.培养一段时间后，预期的实验结果是：B.中的幼苗生长量比C.中的小 C.培养一段时间后，预期的实验结果是：A.中的幼苗生长量比C.中的小 应再增设D.组实验：装置如B.组，在暗处、温度适宜的环境中进行
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