2020-2021学年七年级下册生物苏教版同步课时作业（1）精卵结合孕育新的生命
※题型：单选题※知识点：单选题※试题难度：中等<br>男性产生生殖细胞的器官是( )<br>A.睾丸 B.阴茎 C.输精管 D.阴囊<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/b3c25df57d754bd2b55a120a5c51250a/5EB37C218D6D19EB98E791A4205997A8.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/c2d63a791d2d4a758d1198b94fd66623/AAA8969BAA86F2812E6B497F88002738.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>男性两侧输精管被结扎后,生理上表现为( )<br>A.不产生精子,第二性征改变<br>B.产生精子,第二性征改变<br>C.不产生精子,第二性征不改变<br>D.产生精子,第二性征不改变<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/a8db05709b0044c6acd97dd569b9e158/D9A7E0722DAB5479A60928D5B8864BC6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/823105bef0a846a1b169fd5ee4c6c580/7B31CE8A4285161C4D6C780FFD7958DF.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>二胎政策全面放开后,洋洋的妈妈想再生一个孩子。一年多来,一直没有怀孕。经检查,原因是输卵管堵塞。输卵管堵塞造成的后果是( )<br>A.不能产生卵细胞 B.胚胎的发育得不到营养<br>C.精子与卵细胞不能结合 D.不能产生雌性激素<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/930377e75b7c4bf291453b3dcefe8cd4/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/0d38baacec3f4294865e9caf2c3dbd2a/369F865B1ADAD7D6C335ED96F81EA02F.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>人的生命是宝贵的,新的生命的起点是( )<br>A.排出精子时 B.排出卵子时<br>C.形成受精卵时 D.胎儿出生时<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/9c6f916e2a77463ca9f949d25b74e49e/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/9bb9bc267ddb4913b91a2a1fb68e6a42/3FEF838E2824A91D9BD4D702E1408F91.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>在自然情况下,人的受精过程及胚胎的发育过程分别发生在( )<br>A.输卵管、输卵管 B.输卵管、子宫<br>C.子宫、子宫 D.卵巢、子宫<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/049a8d11152c42f3aa250265a35e315a/4EF59C4461E28F3B3B09551EB8B9AC3F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/e9d34962d31b473dbf8a63c3097ec60a/122FCE9A9B18CB40D0C5368C68C53F52.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>人体胚胎发育初期所需要的营养物质来自( )<br>A.胎盘 B.脐带 C.卵黄 D.子宫<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/881dc412c038433e94af1a0b4e8fbe0f/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/7df4edb4f9d94212af2924891ff7d341/2F9510AFA1931425123069702FDEEE46.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>有人把“试管婴儿”理解成在试管里生出孩子,这是不正确的。其实“试管婴儿”是指利用人工的方法使精子与卵细胞结合形成受精卵并逐渐形成早期胚胎,其中“试管”相当于女性生殖器官中的( )<br>A.卵巢 B.输卵管 C.子宫 D.阴道<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/1d3f4e8142b74abe9d2ea9f92ca01a00/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/79002328b09b41c68ffa977684f114ef/E00E8B759C960FA3CC817DD0A24B31A0.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>有关受精卵发育的正确顺序是( )<br>①组织分化 ②受精卵分裂 ③形成胎儿 ④器官形成 ⑤分娩A.②③④⑤① B.①②③④⑤ C.②①④③⑤ D.②①③⑤④<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/c5f0b40d5a9c43379c989fb68650ecab/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/25b652fd7a8f4478ac6d7e668b0bdbf9/266A19136DC72BF843E7AC1D95DDAB0B.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>如图是人的生殖及胚胎发育过程简图。下列各选项对图中①②③④的判断不正确的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2020/7/20/7F603DF4AF16D8F3F950BF43C61AC4AA.png"><br>A.①—精子 B.②—卵巢 C.③—受精卵 D.④—分娩<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/435eebd49cef41efa5a875a0ca61dded/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/70a122ba91ca4379a5b5acc69780bcbc/B6370B57BA859C18E0CDB0483CD60F5D.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列关于胚胎发育过程的叙述正确的是( )<br>A.第八周末,胚胎发育基本完成<br>B.第十二周,胚胎开始初现人形<br>C.第十二周,已经能够分辨出性别<br>D.八个月末,脸部特征明显,毛发形成<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/93b52184aafe4a53b2884ff06a77b298/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/f3137d39bd634676a58d92970b924555/EF73F97DD0021EC8131E391CC9F3794E.png"><br><br>※题型：读图填空题※知识点：读图填空题※试题难度：中等<br>如图为排卵、受精、受精卵发育和胚泡植入子宫内膜的连续过程<br>请据图<br>:<br><img src="https://picture2.zhihuicn.com/testImage/2/2020/1/7/401E2180BECAB97CF2965AF4888E5A21.png"><br>1.写出图中所示部分的名称,。2.受精发生的场所;胚胎发育的主要场所是。3.图中卵巢的功能是产生和分泌。4.在胚胎发育过程中,通过从母体吸取氧气和养料,排出二氧化碳等代谢废物。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/bfeecd35175f43fe84958858ed37bd99/F973513FA4CEF60E2D4D16BAABA0A823.png"><br>解析<br>略<br>
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