问题 实验题

冬暖式蔬菜大棚已成为我国发展现代化“菜篮子”工程的重要模式。下图是一个温室大棚内的一株番茄的生长发育过程示意图。请据图分析回答:(每空1分,共5分)

(1)在蔬菜生产旺盛时期,透明塑料膜内长有一些水滴,这些水滴主要来自植物的     

(2)某菜农为提高番茄的产量,采取了以下几项措施:①适当提高二氧化碳浓度;②合理密植,间作套种;③夜晚控制的温度应适当降低;④适当增加光照时间。其中属于增强光合作用的措施是                。(填序号)

(3)[①]→[②]→[③]完成的生理过程依次是                      

其中:[①]→[②]阶段,农民常采用                         的方法来完成。

[④]→[⑤]阶段,农民常采用                         的方法来完成。[

答案

:(1)大棚内培养液水分的蒸发和植物的蒸腾作用都会导致透明塑料膜内出现一些水滴,生长旺盛的植物蒸腾产生水分是主要因素.

(2)白天增加光照,使光合作用增强,制造的有机物增加,夜晚降低温度,可以降低呼吸作用强度,分解的有机物减少,总体使蔬菜积累的有机物增加,产量提高.农家肥通过微生物的分解作用,可以把其中的有机物分解并产生二氧化碳.

(3)由图可知图中从[①]→[②]表示的生理过程花粉落在了柱头上,表示的是传粉,图中3可看出花粉管进入珠孔,其末端破裂后放出精子.其中一个精子与卵细胞融合为受精卵,将来发育成胚;另一个精子与两个极核融合形成胚乳核,将来发育成胚乳.这一过程称为双受精.表示的生理过程为受精.

在农业生产上常采用人工辅助授粉的方法,以克服因条件不足而使传粉得不到保证的缺陷,以达到预期的产量.

在播种前用水浸泡种子,是给种子萌发时提供适量的水分

点评:遇到这样的题目,同学们不要有畏难情绪,多看几遍,把题目读懂,针对各个问题,通过咱们平时积累的知识,逐一解决.

阅读理解

If you do not use your arm or your legs for some time, they become weak; when you start using them again, they slowly become strong again. Everybody knows that. Yet many people do not seem to know that memory works in the same way. When someone says that he has a good memory, he really means that he keeps his memory in practice by using it. When someone else says that his memory(记忆力) is poor, he really means that he does not give it enough chance to become strong. If a friend says that his arms and legs are weak, we know that it is his own fault(过错). But if he tells us that he has a poor memory, many of us think that his parents are to blame(受责备), and few of us know that it is just his own fault. Have you ever found that some people can’t read or write but usually they have better memories? This is because they cannot read or write and they have to remember things they cannot write down in a little notebook. They have to remember days, names, songs and stories; so their memory is the whole time being exercised. So if you want to have a good memory, learn from the people: Practice remembering.

小题1:The main reason for one’s poor memory is that _______.

A.his father or mother may have a poor memory

B.he does not use his arm or legs for some time

C.his memory is not often used

D.he can’t read or write小题2:If you do not use your arms or legs for some time _______.

A.you can’t use them any more

B.they will become stronger

C.they become weak and won’t become strong until you use them again.

D.they will become neither stronger nor weaker小题3:Which of the following is NOT true?

A.Your memory works in the same way as your arms or legs.

B.Your memory, like your arms or legs, becomes weak if you don’t give it enough chance for practice.

C.Don’t learn how to read and write if you want to have a better memory.

D.A good memory comes from more practice.小题4:Some people can’t read or write, but they usually have better memories, because _______.

A.they have save much trouble

B.they have saved much time to remember things

C.they have to use their memories all the time

D.they can’t write everything in a little notebook小题5:Which is the best title for this passage?

A.Don’t Stop Using Your Arms or Legs

B.How to Have a Good Memory

C.Strong Arms and Good Memories

D.Learn From the People

问答题 简答题