2020-2021学年人教版七年级上册生物单元测试AB卷 第三单元第三章 绿色植物与生物圈的
※题型：单选题※知识点：单选题※试题难度：中等<br>水分进入植物体以后的运输途径是( )<br>A.在导管和筛管中,沿着叶<img src="https://picture2.zhihuicn.com/testImage/2/2019/6/26/464231769519C31BD596A755B8860D5A.png"><br>茎<img src="https://picture2.zhihuicn.com/testImage/2/2019/6/26/464231769519C31BD596A755B8860D5A.png"><br>根的方向运输<br>B.在筛管中,沿着叶<img src="https://picture2.zhihuicn.com/testImage/2/2019/6/26/464231769519C31BD596A755B8860D5A.png"><br>茎<img src="https://picture2.zhihuicn.com/testImage/2/2019/6/26/464231769519C31BD596A755B8860D5A.png"><br>根的方向运输<br>C.在导管中,沿着根<img src="https://picture2.zhihuicn.com/testImage/2/2019/6/26/464231769519C31BD596A755B8860D5A.png"><br>茎<img src="https://picture2.zhihuicn.com/testImage/2/2019/6/26/464231769519C31BD596A755B8860D5A.png"><br>叶的方向运输<br>D.在导管和筛管中,沿着根<img src="https://picture2.zhihuicn.com/testImage/2/2019/6/26/464231769519C31BD596A755B8860D5A.png"><br>茎<img src="https://picture2.zhihuicn.com/testImage/2/2019/6/26/464231769519C31BD596A755B8860D5A.png"><br>叶的方向运输<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/dbc33c74d9734066b29881a5b96b000f/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/d937afc8514a4ce2b09211c1a2915ee4/B907D910C23020889B6960703A76082F.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>对“树怕剥皮,不怕空心”的解释正确的是( )<br>A.“剥皮”会割断木质部中的筛管,影响有机物的运输<br>B.“剥皮”会割断韧皮部中的导管,影响水分和无机盐的运输<br>C.“空心”是空去髓和部分木质部,不影响水和无机盐的输送<br>D.“空心”是空去髓和全部的木质部,不影响有机物的输送<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/d89e59df80094ae0a88d6a3c3cda1f6a/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/014dc3b5b30a4541905dcd987cf8a500/03A9107566298DA28495A0F08121282C.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>在家移栽、换盆的时候,往往选择在傍晚时分进行,培土结束后再适当剪除一些叶片有利于被移栽植物的成活,其主要原因是( )<br>A.避免呼吸作用对有机物的消耗<br>B.避免蒸腾作用过多失水<br>C.避免大风吹倒新栽的植物<br>D.避免阳光直射损伤须根<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/f0644cbabbf345f081984cb1bd7b3196/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/22e3800e6f8a4a3aa2df5bd6e9fdee49/F6C3A38B7CD336D8C651E8E531EBF7D5.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列各项生理活动中,受气孔开闭影响的有( )<br>①蒸腾作用<br>②光合作用<br>③呼吸作用<br>④水分的吸收和运输<br>⑤无机盐的吸收A.①② B.①②③ C.①②③④ D.①②③④⑤<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/dfbb96323f6f4306aff053696a8ffbc3/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/d49144ae1e104c8fa9ef0b217975cc68/A45E5916EDE2380FBE9FA33DEF0865E1.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>如图是蚕豆叶下表皮气孔张开和闭合的电镜扫描照片,下列有关叙述错误的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2020/8/10/7E1D2304DF18B28A86EA013F69E23ED9.png"><br>A.气孔是气体交换的“门户”,水分以气体形式也可以通过气孔散失<br>B.夜幕降临时,叶片大多数气孔呈①状态,蒸腾作用随之减弱<br>C.当太阳升起时,叶片气孔可由状态②转为状态①<br>D.气孔由状态①转为状态②,可能影响无机盐的运输<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/416ff5026d234e8286801ce9d9a14052/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/dc818a5301684215883dfab46646cb8b/571EC881DD349C2EC4F705639B0374FF.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>气孔是气体进出叶片的“窗口”,这里所说的气体指的是( )<br>A.空气、水蒸气、氮气<br>B.二氧化碳、氧气、氮气<br>C.二氧化碳、氧气、水蒸气<br>D.水蒸气、氧气、空气<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/9c047702d7084e18ad273799912cbb99/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/f1ed365e26e74e81a5b974470a8e2ff1/90950FD6045AC5178F6976430550FDA3.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>如图是气孔处于张开和闭合状态的示意图,下列有关叙述不正确的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2019/9/9/83FBE7A2871436C4504024182AA741F5.png"><br>A.甲图中①表示保卫细胞<br>B.②是水和空气进出叶片的通道<br>C.甲图表示①所围成的结构处于张开状态<br>D.乙图表示的气孔状态不影响二氧化碳和氧气进出叶片<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/591b917b783c41cb99b127dbdfd7f257/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/c2a67b6a454c440e984d1fee6436dad1/7C453E0DEC474C9EE8DD8A9A5D269418.png"><br><br>
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