2020-2021学年八年级生物人教版寒假提前学（4）鸟的生殖和发育
※题型：单选题※知识点：单选题※试题难度：较易<br>蜂鸟是世界上最小的鸟类,它的卵仅重1g,而鸵鸟卵可重达1500g。无论蜂鸟卵还是鸵鸟卵,将来发育成雏鸟的结构都是( )<br>A.卵白 B.卵黄 C.胚盘 D.系带<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/3f06c562c37e42338edf1dd295d965dd/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/df2dca750b30437eabc256209ffe2dd7/FF7F6AD461FD1A1298D74461E53EB80F.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列有关鸟卵真正的结构说法正确的是( )<br>A.卵白 卵黄 卵黄膜<br>B.卵黄 卵壳 外壳膜<br>C.卵黄膜 卵黄 胚盘<br>D.卵白 卵黄 胚盘<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/b2402a065da44fb2937013e916754325/D7C9A679F3C72D4F1064B7D0A0FD4AD8.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/f2f2f4d1f1f64dd9b4adcbcf79379f74/F4CA8133E2D7208C9C4F9F5B45753AE2.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>受精的鸡卵具有的特征是( )<br>A.胚盘颜色浓且略小 B.胚盘颜色淡且略小<br>C.胚盘颜色浓且略大 D.胚盘颜色淡且略大<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/ae25b0677d2a4222b83e44779e860778/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/b390225603564da78f93b40af360d5c6/702829DBAC9B4F804A2C85B53765CD20.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>鸟类的受精方式与胚胎发育方式分别是( )<br>A.体内受精、卵生 B.体内受精、胎生<br>C.体外受精、卵生 D.体外受精、胎生<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/7691125fbdaf4eceb050ee89ff7bf8dc/C6DD893B0461FAD877175A7ECBBD5939.png"><br>解析<br>略<br>※题型：读图填空题※知识点：读图填空题※试题难度：中等<br>下图是鸡蛋的结构图<br>据图作答:<br><img src="https://picture2.zhihuicn.com/testImage/2/2020/10/20/4B10FC78583CA4563D872FE70E484C01.png"><br>1. 填出又图中下列序号所指的结构名称:①;②;③;④;⑤;⑦。2.标号和为胚胎发育提供营养。<br>3.卵黄中央盘状的小白点是,在适宜的条件下发育成。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/37b30845a6ac4440b9d2d9ca6adf0ccb/6F0D0F5E09E6B9F46DA5B3DDF58E104C.png"><br>解析<br>略<br>
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