2020-2021学年七年级生物上册人教版同步课时作业3.2.3开花和结果
※题型：单选题※知识点：单选题※试题难度：中等<br>下列关于花的叙述,不正确的是( )<br>A.花由花芽发育而来<br>B.花是被子植物的营养器官<br>C.花与果实和种子的形成有关<br>D.花有两性花和单性花之分<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/b9652be3d7144b21bfa63ee61b9f37ee/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/60968b4adb4f425dbabcb13969dd44f1/C676A92A82DAF6AB15608334EF9D3CC6.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>“儿童急走追黄蝶,飞入菜花无处寻”。黄蝶对菜花的作用是( )<br>A.提供养料 B.防治害虫 C.延长花期 D.帮助传粉<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/b221c09642c547ff9f51bc6c397880f2/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/23a9b2e73c714525bfde817dc2a1978d/213D26AD23B8AADE403D629ECD8B9278.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>如图为花的传粉过程示意图,下列叙述不正确的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2019/9/3/D4FAF20C1E9014997CB0582B13DEAEA0.png"><br>A.由图可知,该花属于两性花<br>B.图中①②与果实和种子的形成有关<br>C.由③组成的花冠鲜艳美丽,是花的主要结构<br>D.图中所示传粉方式为异花传粉<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/93f72f53a8004615b4c64354134ec9c9/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/1e20a752d6ab4256876b5c9f0003eae7/810EAD114C98661C787006A717574D42.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>如图是桃花部分结构示意图,下列相关说法错误的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2019/9/3/B2E5E3469C3D10FD728FD25DC6196D54.png"><br>A.桃花是两性花<br>B.花粉管内有两个精子,桃花的受精方式属于双受精<br>C.将来发育成种皮<br>D.受精后形成受精卵,将来发育成胚<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/72829aa61db345bfb0bb362aad5ba74a/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/9b32f20d4e764f35927bab5682ab5c47/42346DF225F8A7FC9E572C4626A35040.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>绿色开花植物的受精过程依次是( )<br>①一个精子与卵细胞融合,另一个精子与中央细胞的极核融合<br>②花粉管进入子房<br>③花粉管到达胚珠<br>④受柱头黏液刺激开始萌发<br>⑤花粉管顶端破裂,释放出精子<br>⑥花粉落在雌蕊柱头上<br>⑦长出花粉管A.⑥④⑦②③⑤① B.⑥⑦④③②⑤①<br>C.⑥⑦①③②④⑤ D.④⑤②③①⑥⑦<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/10eb6b342148418cb1efb65634e72e3c/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/4c68eceba57c4dae8bfb89543db231ba/84EDB4059D50BD8AA4E8DCEEDF2667B1.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列花的各部分发育成的结构中哪一项是错误的( )<img src="https://picture2.zhihuicn.com/testImage/2/2019/6/26/35C563D24B07E632A799D006639896AF.png"><br>A.A B.B C.C D.D<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/6f30064a88e24253af8ba33622a8fa89/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/3a4d2233a5e44d9181a0aa5714622bad/0A3B82C6ECB208007792467BE001FEE9.png"><br><br>
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