2020-2021学年生物北师大版七年级上册同步实验室（二十一）观察根毛
※题型：单选题※知识点：单选题※试题难度：中等<br>移栽植物时往往暂时出现萎蔫现象,这是由于( )<br>A.水分的输导受到阻碍<br>B.一些根毛和幼根折断,降低了对水分的吸收能力<br>C.没有及时浇水<br>D.一些根毛和幼根被拉断,降低了对无机盐的吸收能力<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/b8fc5597e7974f22b3363551f4307633/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/9196bc1bab3a4576be5fae52b20f9344/8E7721D22CBC6DE535640CC55E1E81C0.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>用肉眼观察幼根时,常看到一些“绒毛”,这是( )<br>A.侧根 B.不定根 C.根尖 D.根毛<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/8bd51c61b95e4609b1c6d6f2878a7c9c/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/162856fb152643b99b44cdd6883700e2/D2EBA0EE3683E4ED9CD6A5DBEAE35F91.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>吸收水分的植物根主要是纤细的幼根,因为幼根有( )<br>A.根冠 B.分生细胞 C.导管 D.根毛<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/ce67a64b2fbc4480b8cd46825cfeae50/D9A7E0722DAB5479A60928D5B8864BC6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/3476b756bacf49bb82dfd7229e640211/B06D418D99D8EAED55FD0268914294FB.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>“滩涂能种菜,海水能灌溉。”这是美国著名的未来学家阿尔曼托夫勒的预言,如今在盐城沿海滩涂上已逐渐变成现实。盐碱地上的植物能强烈的从土壤中吸收水分的主要原因是( )<br>A.根毛细胞吸胀作用大 B.根毛细胞液浓度大<br>C.根毛细胞呼吸旺盛 D.叶肉细胞蒸腾作用强<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2014/31819004aaaf4b58af8be3d78530419e/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2014/53934802eec64053bf2569805e6cdeba/42CB912AE87CA1507CAB280F45A37C67.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>根毛存在对植物的意义是( )<br>A.增加根的牢固性 B.保护根尖<br>C.增加吸收面积 D.加快营养运输<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2011/cd76a7c5d3ca46808b4cfca29fabf710/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2011/c9cde84efa3a435db1146b7cb404bcd9/063D682957D7A3F361B0F55C0D2018F6.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>“揠苗助长”会使幼苗死亡,这是因为损伤了( )<br>A.幼苗的老根 B.幼苗的幼根和根毛<br>C.幼苗的茎 D.幼苗的叶<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/bcf038682b6b417e9fd9d12e63c36f72/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/fcbba495408c4d4782fd1e14ef98d3cc/35E57A547CE34048EC25BEB995AAAAAE.png"><br><br>
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