2020-2021学年苏教版七年级上册生物课堂小测 3.5.5植物的开花和结果
※题型：单选题※知识点：单选题※试题难度：中等<br>一朵花中,与繁殖后代直接相关的结构是( )<br>A.花瓣 B.蜜腺 C.雌蕊和雄蕊 D.花丝和花药<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2014/aa4ba0f150504a83b592545614ef7b21/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2014/bdedacada5514ed5bc95add48949864f/F7B59256DAD325AA95EB9A71A6CEF7F7.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>小麦花的主要部分是( )<br>A.雌蕊和雄蕊 B.花托和花柄 C.花瓣和花萼 D.果实和种子<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/d64efc3d9e6a4734a47adee665d8dbe4/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br>略<br>※题型：单选题※知识点：单选题※试题难度：较易<br>玉米开花时如果遇到连绵阴雨,果实产量就会降低。下列哪项解释可作为玉米产量下降的原因( )<br>A.风大、气温低,花粉不成熟<br>B.花粉被雨水冲落,影响风力传粉<br>C.阴雨,子房不能发育<br>D.风大,气温低,影响昆虫传粉<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2013/f63b55fb4d9840fe9acd15b9a3130d81/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2013/5c9e9e3d8ad242d2b10754d121788ccd/9A72B5A1F00CA9E91DEFCC3C99638B23.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>花粉和胚珠存在的结构分别是( )<br>A.子房和花药 B.花药和子房 C.花丝和子房 D.花丝和花柱<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2013/50ba7313057f4132844e9a50c3bd9d49/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2013/232ac5f19be04ea69a271eaa3b457ef8/7347FD1D6DDB1F8AB9349C90AB89F750.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>平凉是全国苹果生产最佳适宜区。红富士系列苹果个大、色艳、硬度大、糖分高、耐贮存,深受消费者青睐。苹果中的种子是由花的什么结构发育而成的( )<br>A.子房壁 B.胚珠 C.子房 D.花柱<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/4fc5aa75a9494ed1813fa83e2b41c12c/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/e4845ba91db84848988306f654db7fe2/200DC4054A95EC612E837ECAF4FCADB5.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列关于西瓜的叙述,不正确的是( )<br>A.整个西瓜是由子房发育来的<br>B.西瓜里的所有种子是由一个胚珠发育来的<br>C.西瓜皮是由子房壁发育来的<br>D.胚珠内的受精卵发育成种子的胚<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2018/96004e247d4d49b4b9560277c001d5c1/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2018/0e33fca9f86d4aaa93ebac4ed120ee1f/C2BAA23306012F52A06EA0350D54CB1E.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>如图是花的结构模式图,请据图回答问题。<img src="https://picture2.zhihuicn.com/testImage/2/2019/7/17/5FD77A6E58FA0F8F09880527886E01B7.png"><br>1.花的雌蕊由①柱头、④花柱和⑤构成。<br>2.花的雄蕊包括花丝和两部分(填标号)。<br>3.经过传粉和受精后,整个⑤发育成,⑤内的⑥发育成。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/b48f3d8df8d042ea88bf4cc4cde375fa/D5596146C0F7142A68B21ECAC1561A0F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/9b76ab97393b4c3da4168de7dc09baa7/6C27A9FCFD5BEE8920E845FE6586B668.png"><br><br>
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