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2026年春期八年级生物下册期中试卷(人教版)

  • 2026-04-19 07:39:34
2026年春期八年级生物下册期中试卷(人教版)

2026年春期八年级生物下册期中试卷(人教版)

考试时间:60分钟 满分:100分

一、单项选择题(每题2分,共40分)

1.下列属于无性生殖的是()

A. 花生开花结果 B. 马铃薯块茎繁殖 C. 水稻种子播种 D. 菜豆种子繁殖

2.嫁接成活的关键是()

A. 接穗和砧木的形成层紧密结合 B. 选用粗壮的砧木

C. 选择春季嫁接 D. 接穗带饱满芽

3.下列昆虫发育过程属于完全变态的是()

A. 蝗虫 B. 蟋蟀 C. 家蚕 D. 螳螂

4.青蛙的生殖和发育特点是()

A. 体内受精、变态发育 B. 体外受精、变态发育

C. 体内受精、直接发育 D. 体外受精、直接发育

5.鸟卵中发育成雏鸟的结构是()

A. 卵黄 B. 卵白 C. 胚盘 D. 系带

6.下列不属于相对性状的是()

A. 豌豆的高茎与矮茎 B. 兔的白毛与黑毛

C. 狗的卷毛与粗毛 D. 人的双眼皮与单眼皮

7.染色体的组成是()

A. DNA和糖类 B. DNA和蛋白质 C. 蛋白质和脂质 D. DNA和基因

8.控制生物性状的基本单位是()

A. 染色体 B. 细胞核 C. 基因 D. DNA

9.体细胞中染色体和基因的存在方式是()

A. 成单存在 B. 成对存在 C. 部分成对 D. 随机存在

10.双眼皮(A)对单眼皮(a)为显性,一对双眼皮夫妇生了单眼皮孩子,夫妇基因组成是()

A. AA×AA B. AA×Aa C. Aa×Aa D. Aa×aa

11.下列属于可遗传变异的是()

A. 晒太阳变黑 B. 水肥充足麦穗大 C. 转基因抗虫棉 D. 手术割双眼皮

12.原始大气不包含()

A. 甲烷 B. 氧气 C. 氨气 D. 氢气

13.米勒实验证明了()

A. 原始生命起源 B. 无机物合成有机小分子

C. 有机小分子合成有机大分子 D. 有机大分子形成原始生命

14.生物进化的直接证据是()

A. 胚胎学证据 B. 比较解剖学证据 C. 化石证据 D. 分子生物学证据

15.生物进化的总体趋势不包括()

A. 简单→复杂 B. 低等→高等 C. 陆生→水生 D. 小型→大型

16.自然选择的基础是()

A. 过度繁殖 B. 遗传变异 C. 生存斗争 D. 适者生存

17.人类起源于()

A. 大猩猩 B. 森林古猿 C. 猴子 D. 长臂猿

18.下列生殖方式中,后代变异性最大的是()

A. 嫁接 B. 扦插 C. 种子繁殖 D. 组织培养

19.下列关于基因的叙述,错误的是()

A. 基因是有遗传效应的DNA片段 B. 基因在染色体上呈线性排列

C. 一条染色体上有一个基因 D. 成对的基因位于成对染色体上

20.下列关于变异的叙述,正确的是()

A. 变异对生物生存都有利 B. 变异都能遗传给后代

C. 变异是生物进化的原材料 D. 变异只发生在动植物

二、填空题(每空1分,共15分)

21.有性生殖由________结合成受精卵发育成新个体;无性生殖不经过________结合。

22.家蚕发育经过________、幼虫、________、成虫四个时期,为完全变态。

23.鸟卵的________和________为胚胎发育提供营养。

24.性状是指生物的________、生理特性和行为方式。

25.显性基因用________字母表示,隐性基因用________字母表示。

26.生物的变异分为________变异和________变异。

27.达尔文的________学说解释了生物进化的原因。

28.生物进化的总体趋势:由简单到________、由低等到________、由水生到________。

三、判断题(每题1分,共5分)

29.扦插、嫁接都属于无性生殖。()

30.青蛙的幼体用鳃呼吸,成体用肺兼皮肤呼吸。()

31.生男生女由卵细胞的性染色体决定。()

32.化石是生物进化的唯一证据。()

33.自然选择决定生物进化的方向。()

四、综合题(共40分)

34.下图是植物无性生殖示意图,回答问题(8分)

(1) 图中①是________,②是________。

(2) 该生殖方式是________,分为________接和________接。

(3) 成活关键:①与②的________紧密结合。

(4) 优点:保持________的优良性状,繁殖速度________。

35.下图是鸟卵结构,回答问题(8分)

(1) 卵细胞包括[ ]、[ ]、[ ]________。

(2) [ ]________内有细胞核,发育成雏鸟。

(3) [ ]________和[ ]________提供营养。

(4) [ ]________起保护作用,上有________进行气体交换。

36.下图是染色体、DNA、基因关系,回答问题(8分)

(1) 图中A是________,B是________,C是________。

(2) 染色体主要由________和________组成。

(3) 基因是有________的________片段。

(4) 一条染色体上有________个DNA分子。

37.豌豆高茎(D)对矮茎(d)为显性,分析杂交实验(8分)

亲代:高茎 × 矮茎

子代:全部高茎

(1) 亲代高茎基因组成________,矮茎________。

(2) 子代基因组成________,表现________。

(3) 子代自交,后代性状________,比例________。

(4) 遗传实质:亲代通过________细胞传递________给子代。

38.回答生物进化问题(8分)

(1) 原始生命诞生于________。

(2) 生物进化最直接证据是________。

(3) 自然选择内容:过度繁殖、、适者生存。

(4) 变异是________的,自然选择是________的。

(5) 生物多样性是________的结果。

参考答案

一、选择题

1.B 2.A 3.C 4.B 5.C 6.C 7.B 8.C 9.B 10.C

11.C 12.B 13.B 14.C 15.C 16.B 17.B 18.C 19.C 20.C

二、填空题

21.两性生殖细胞;两性生殖细胞

22.受精卵;蛹

23.卵黄;卵白

24.形态结构

25.大写;小写

26.可遗传;不可遗传

27.自然选择

28.复杂;高等;陆生

三、判断题

29.√ 30.√ 31.× 32.× 33.√

四、综合题

34.(1) 接穗;砧木 (2) 嫁接;枝;芽 (3) 形成层 (4) 接穗;快

35.(1) 3卵黄;4胚盘;5卵黄膜 (2) 4胚盘 (3) 3卵黄;5卵白 (4) 1卵壳;气孔

36.(1) 染色体;DNA;蛋白质 (2) DNA;蛋白质 (3) 遗传效应;DNA (4) 一

37.(1) DD;dd (2) Dd;高茎 (3) 高茎和矮茎;3:1 (4) 生殖;基因

38.(1) 原始海洋 (2) 化石 (3) 遗传变异;生存斗争 (4) 不定向;定向 (5) 自然选择

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  1. CONNECT:[ UseTime:0.000741s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001756s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000832s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000728s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001454s ]
  6. SELECT * FROM `set` [ RunTime:0.000588s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001502s ]
  8. SELECT * FROM `article` WHERE `id` = 480225 LIMIT 1 [ RunTime:0.001853s ]
  9. UPDATE `article` SET `lasttime` = 1776558032 WHERE `id` = 480225 [ RunTime:0.001682s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000731s ]
  11. SELECT * FROM `article` WHERE `id` < 480225 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001369s ]
  12. SELECT * FROM `article` WHERE `id` > 480225 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001196s ]
  13. SELECT * FROM `article` WHERE `id` < 480225 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002200s ]
  14. SELECT * FROM `article` WHERE `id` < 480225 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005317s ]
  15. SELECT * FROM `article` WHERE `id` < 480225 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002549s ]
0.194412s