七年级上章科学练习册答案附练习答案

七年级上章科学练习册答案附练习答案
七年级上章科学练习册答案附练习答案

七年级上章科学练习册答案附练习答案

集团文件版本号:(M928-T898-M248-WU2669-I2896-DQ586-M1988)

科学练习册答案

第8章练习

一、填空:

1.溶质,溶剂;

2.石蕊试液,酚酞试液,pH试纸;

3.玻璃棒,

pH试纸,比色卡; 4.红,红; 5.①,②; 6.二氧化硫;

7.大,小; 8.强腐蚀性,发黑变焦; 9.部分,氢气; 10.

米醋、白醋

二、选择:

11.D 12.D 13.D 14.D 15.B 16.C 17.A

18.A 19.D

三、问题:

20.将氢氧化钠溶液与果导混合,若液体变红,证明果导中含有酚酞成

分。

21.⑴红,酸;紫,中;蓝,碱

⑵在溶液A中加入碱性溶液;

在溶液C中加入酸性溶液。

22.⑴偏酸性的;⑵棉花.

11.2视觉

一、填空:

1.直线;

2.像,倒立;

3.瞳孔;

4.视网膜;

5.角膜;

6.黑暗,强烈;

7.视神经;

8.光学仪器;

9.远视,近视; 10.前面.

二、选择:

11.C 12.A 13.A 14.B 15.B 16.C 17.A 18.B

19.C 20.C 21.B 22.B 23.B 24.B 25.A

三、问题:

26. 发光体:蜡烛火焰、通电的灯泡、霓虹灯;

不发光体:铅笔、水杯、黑板;

27. ⑴70°;⑵70°;⑶40°.

28. ⑴因为照片将闪光灯经平面镜反射的灯光也拍进去了.

⑵拍的时候避开镜子.

29. 光沿着直线传播.

30. ⑴变小;⑵较亮但模糊;⑶凸透镜.

31. ⑴2,视网膜;⑵3,视神经;⑶4,晶状体;⑷5,玻璃体;

⑸1,盲点.

32. ⑴眼球前后径过长或晶状体太厚;

⑵长时间看书后,用眼过度紧张和疲劳.

⑶凸透镜;⑷在虚线方框内画凹透镜

33. 略

11.3听觉

一、填空:

1.振动;

2.频率,赫兹(Hz)

3.音调,频率;

4.放大并传递到内耳;

5.耳廓;

6.噪声,分贝(dB)

7.工业、交通、建筑工地、社会

生活

二、选择:

8.C; 9.B; 10.D 11.A 12.B 13.C 14.B 15.C 16.C

17.A 18.B 19.B

三、问答:

20.声音可以在固体中传播.

21.声音不可以在真空中传播.

22.⑴略;⑵接受声波,并将它传到中耳;⑶听神经.

11.4嗅觉、味觉和触觉

一、填空:

1.味蕾;

2.酸、甜、苦和咸;

3.嗅觉;

4.对气味敏感的神经末梢;

5.下降,减弱,会;

6.皮肤,颈,指尖.

二、选择题:

7.D 8.C 9.C 10.D

三、问答:

11.指尖有较多感觉细胞.

12.略

13.敏感度降低

14.皮肤的表面下分布着很多能感知压力、冷热、疼痛等刺激的神经末梢.

11.5脑与感觉

一、填空

1.神经细胞,颅骨;

2.大脑;

3.刺激,缩短,服药(饮酒);

4.大脑,适当休息。

二、选择:

5.C

6.C

7.C

三、问题:

8.⑤②④③①

11.6药物和溶剂对感觉的影响

一、填空:

1.呼出气体中酒精的浓度;

2.绿色,浓

第11章练习

一、填空:

1.振动,大脑;

2.嗅,味,嗅觉和视觉;

3.反应迟钝;

4.颅骨,大脑,感觉神经,运动神经,反应

二、选择:

5.A

6.B

7.B

8.B

9.C 10.A 11.D 12.B 13.B

14.B

三、略

四、问题:

17.⑴角膜;瞳孔;晶状体;视网膜.

⑵睫状肌松弛,晶状体变薄;

⑶晶状体,视网膜

⑷倒,在针孔前放置凸透镜.

⑸a.视网膜; b.晶状体,睫状肌; c.配戴凹透镜,视网膜

⑹a.近视; b.抽取空腹时的血液,测出血清中的锌含量;

18.⑴从上到下依次是:④②①③⑤⑥

⑵鼓膜,听小骨

⑶外耳道,听小骨,感觉细胞,听神经

19.⑴A大脑B小脑C脑干;

⑵接受信息,分析信息,错觉

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