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初中生物学中考一轮复习课件《第22讲生物的生殖》

  • 2026-06-14 11:07:38
初中生物学中考一轮复习课件《第22讲生物的生殖》

2026 中考生物一轮|生物的生殖,植物 + 动物全考点一遍过!

中考生物一轮复习第 22 讲来了!植物生殖、昆虫发育、两栖动物、鸟类生殖四大板块全覆盖,识图必背、易错陷阱、解题技巧一次讲清,生殖专题稳稳拿分~

✅考点 1:植物的生殖

🌿有性生殖

  • 概念:两性生殖细胞结合→受精卵→新个体
  • 特点:后代具双亲遗传特性,变异大、利于进化
  • 实例:种子繁殖、小麦 / 玉米 / 油菜播种

🌿无性生殖

  • 概念:不经过两性生殖细胞结合,母体直接产新个体
  • 特点:保持亲本优良性状、繁殖快
  • 常见方式:
    • 嫁接
      接穗 + 砧木,关键形成层紧密结合,果实性状随接穗
    • 扦插
      剪枝插入土 / 水,月季、绿萝、葡萄常用
    • 压条
      枝条埋土生根,桂花、石榴
    • 组织培养
      无菌快繁,脱毒苗、工厂育苗

🌿有性 vs 无性生殖

  • 本质区别:是否经过两性生殖细胞结合
  • 有性:变异大、适应强;无性:性状稳、繁殖快

✅考点 2:动物的生殖

🦋昆虫的生殖与发育

  • 生殖:有性生殖、体内受精、卵生
  • 完全变态发育(4 期):卵→幼虫→蛹→成虫代表:家蚕、蜜蜂、菜粉蝶、蚊、蝇
  • 不完全变态发育(3 期):卵→若虫→成虫代表:蝗虫、蟋蟀、蜻蜓、蝼蛄
  • 关键:有无蛹期是判断依据

🐸两栖动物的生殖

  • 生殖:有性生殖、体外受精、水中产卵
  • 发育:变态发育过程:受精卵→蝌蚪→幼蛙→成蛙
  • 特点:生殖和发育离不开水
  • 蝌蚪:鳃呼吸、水生;成蛙:肺 + 皮肤呼吸、水陆两栖

🐦鸟类的生殖

  • 生殖:有性生殖、体内受精、卵生
  • 鸟卵结构与功能(必考识图)
    • 卵壳 / 壳膜:保护、透气
    • 卵白:水分 + 营养、保护
    • 卵黄:主要营养来源
    • 胚盘:含细胞核,胚胎发育部位
    • 气室:供氧
  • 特点:生殖发育摆脱水的限制

🐠其他动物速记

  • 鱼类:体外受精、水中发育、卵生
  • 爬行类:体内受精、卵生、真正陆生
  • 哺乳类:胎生哺乳、后代成活率最高

📝中考命题趋势

  • 情境创新:结合农业嫁接扦插、蝴蝶孵化、鸟类保护出题
  • 高频考点:生殖方式判断、昆虫发育区分、鸟卵结构功能
  • 易错重灾区:嫁接性状归属、完全 / 不完全变态、体外 / 体内受精

💡备考小贴士

口诀速记:有性生殖靠受精卵,无性扦插嫁接保性状;昆虫变态看蛹期,两栖受精在水里;鸟卵胚盘育新鸟,体内受精陆地上。

私信回复关键词“第22讲课件”,可自动获取课件。如果觉得课件对您有帮助,麻烦点赞和转发。谢谢!

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  1. CONNECT:[ UseTime:0.000432s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000786s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000267s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000279s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000494s ]
  6. SELECT * FROM `set` [ RunTime:0.000201s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000505s ]
  8. SELECT * FROM `article` WHERE `id` = 508058 LIMIT 1 [ RunTime:0.000811s ]
  9. UPDATE `article` SET `lasttime` = 1782028181 WHERE `id` = 508058 [ RunTime:0.009634s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000290s ]
  11. SELECT * FROM `article` WHERE `id` < 508058 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000855s ]
  12. SELECT * FROM `article` WHERE `id` > 508058 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000402s ]
  13. SELECT * FROM `article` WHERE `id` < 508058 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001376s ]
  14. SELECT * FROM `article` WHERE `id` < 508058 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000733s ]
  15. SELECT * FROM `article` WHERE `id` < 508058 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001061s ]
0.085339s