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2026年中考河北八年级一模生物试卷

  • 2026-04-03 01:00:50
2026年中考河北八年级一模生物试卷

2026年河北省初中学业水平(八年级)结业测评生物学答案及解析

一、选择题(每题1分,共25分)

1. 答案:B

解析:草履虫逃离墨汁区域,是对外界刺激(墨汁)作出的反应,体现生物能对外界刺激作出反应的特征。

2. 答案:C

解析:视野中边缘黑色、中央明亮的圆圈是气泡,是制作临时装片时操作不当导致的;调粗准焦螺旋用于初步对焦,细准焦螺旋使视野更清晰;口腔上皮细胞无细胞壁;载玻片需滴生理盐水维持细胞形态。

3. 答案:D

解析:观察细胞分裂的染色体时,可用碱性染料(如龙胆紫、醋酸洋红)染色;植物细胞分裂是细胞核先分裂,再细胞质分裂;分裂过程会形成新的细胞膜和细胞壁;染色体需复制后平均分配。

4. 答案:A

解析:糖类、脂肪、蛋白质等有机物储存化学能;细胞膜控制物质进出,并非允许所有物质进入;叶绿体是植物细胞特有结构;人的遗传物质DNA主要在细胞核,线粒体也有少量。

5. 答案:A

解析:人体结构层次:细胞→组织→器官→系统→个体;番茄植株无系统,结构层次:细胞→组织→器官→个体;上皮组织有保护分泌功能,保护组织只有保护功能;心脏由多种组织构成;④⑤是器官,结构功能基本单位是细胞。

6. 答案:D

解析:单细胞生物并非都能光合作用,如酵母菌、草履虫不能;酵母菌、青霉是真菌,有成形细胞核;病毒无细胞结构,必须寄生在活细胞内。

7. 答案:C

解析:①无根、茎、叶,是藻类;②有类似茎、叶分化,无输导组织,是苔藓;③有根、茎、叶和输导组织,靠孢子繁殖,是蕨类,更适应陆地环境;三者都不产生种子,属于孢子植物。

8. 答案:C

解析:菜豆种子萌发时先突破种皮的是胚根;玉米种子萌发营养来自胚乳;根尖分生区细胞分裂使细胞数目增多;种植大豆需多种无机盐,氮、磷、钾是主要的。

9. 答案:D

解析:爬行动物卵生,节肢动物是无脊椎动物,两栖动物幼体用鳃、成体用肺和皮肤呼吸;线虫动物体表有角质层,属于无脊椎动物。

10. 答案:B

解析:小麦和玉米同科不同属,小麦和棉花不同科,共同特征越多亲缘关系越近;分类单位“属”比“科”小,包含生物种类更少。

11. 答案:A

解析:A试管黑暗,水草和小鱼都呼吸,消耗氧气产生二氧化碳,二氧化碳浓度最高;B试管水草不能光合作用,小鱼呼吸也产二氧化碳;C、D试管水草光合作用吸收二氧化碳。

12. 答案:D

解析:甲内壁水珠多是因为天竺葵光合作用和蒸腾作用更强,蜡烛燃烧释放水分不是主要原因;实验遵循单一变量原则;光合作用产生氧气,蜡烛燃烧消耗氧气。

13. 答案:C

解析:受精卵在输卵管形成;胎儿通过胎盘和脐带从母体获得营养;受精卵发育成胎儿需细胞分裂和分化;分娩是胎儿从母体阴道产出,胎盘随之排出。

14. 答案:B

解析:淀粉在口腔初步消化为麦芽糖,在小肠彻底消化;蛋白质在小肠最终分解为氨基酸;脂肪在小肠被胆汁乳化后消化,胆汁无消化酶;早餐需搭配果蔬等补充维生素。

15. 答案:A

解析:肺与外界气体交换通过呼吸运动实现;图甲是呼气,膈顶部上升;b点肺内气压等于外界气压;bc段是呼气,图乙是吸气。

16. 答案:C

解析:若b为组织细胞处毛细血管,血液流经后氧气减少、二氧化碳增多;肾小球处a、c都流动脉血;肺泡处毛细血管a静脉血、c动脉血;小肠处毛细血管营养和二氧化碳增加。

17. 答案:B

解析:视觉形成:光线→角膜→瞳孔→晶状体→玻璃体→视网膜→视神经→大脑皮层视觉中枢;听觉形成:声波→外耳道→鼓膜→听小骨→耳蜗→听神经→大脑皮层听觉中枢;近视需凹透镜矫正;听觉感受器在耳蜗。

18. 答案:C

解析:谈虎色变是条件反射,膝跳反射、眨眼反射、缩手反射是非条件反射。

19. 答案:D

解析:激素由内分泌腺分泌,直接进入血液,含量少作用大,有促进也有抑制作用。

20. 答案:A

解析:相对性状是同种生物同一性状的不同表现形式,人的有耳垂和无耳垂符合;狗和猫、篮球和足球不是同种生物,豌豆圆粒和黄粒是不同性状。

21. 答案:C

解析:分解者是细菌和真菌,绿色植物是生产者,动物是消费者,阳光是非生物部分。

22. 答案:C

解析:流感病毒是传染源,主要通过空气、飞沫传播;隔离患者是控制传染源,通风消毒是切断传播途径;接种疫苗刺激产生抗体,属于保护易感人群;流感痊愈后人体有免疫力,疫苗需每年接种是因病毒易变异。

23. 答案:C

解析:女性体细胞性染色体为XX;精子性染色体是X或Y;生男生女取决于父亲提供的精子类型;第三胎生男生女概率各50%。

24. 答案:B

解析:试管婴儿技术经过两性生殖细胞结合,属于有性生殖;马铃薯块茎、草履虫分裂、酵母菌出芽都是无性生殖。

25. 答案:D

解析:生物进化是长期的过程,并非短期内完成;进化总体趋势由简单到复杂,化石是重要证据,达尔文提出自然选择学说。

二、非选择题(共35分)

26.(8分)

(1)流线;减少飞行/游泳时的阻力

(2)飞行;尾部和躯干部

(3)肺;气囊

(4)鳃;G

27.(7分)

(1)心室;静脉;主动脉;肺动脉;较少

(2)运输氧气

(3)d

28.(7分)

(1)A、D;B、C;非特异性;生来就有,不针对某一特定病原体

(2)抗体;特异性

(3)计划免疫

29.(7分)

(1)将叶片内原有的淀粉运走耗尽;叶绿素

(2)淀粉;光

(3)二氧化碳;不变蓝

30.(6分)

(1)DNA;蛋白质

(2)生殖细胞

(3)Aa;25%;AA或Aa

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  1. CONNECT:[ UseTime:0.000560s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001015s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000334s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000283s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000634s ]
  6. SELECT * FROM `set` [ RunTime:0.000229s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000634s ]
  8. SELECT * FROM `article` WHERE `id` = 468388 LIMIT 1 [ RunTime:0.000388s ]
  9. UPDATE `article` SET `lasttime` = 1775213892 WHERE `id` = 468388 [ RunTime:0.013637s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.001485s ]
  11. SELECT * FROM `article` WHERE `id` < 468388 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000623s ]
  12. SELECT * FROM `article` WHERE `id` > 468388 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001956s ]
  13. SELECT * FROM `article` WHERE `id` < 468388 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001133s ]
  14. SELECT * FROM `article` WHERE `id` < 468388 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001146s ]
  15. SELECT * FROM `article` WHERE `id` < 468388 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002794s ]
0.100996s