叶绿体的作用是[]A．呼吸作用B．光合作用C．蒸腾作用D．运输作用-七年级生物

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• 玉米种子内储存的化学能来自阳光，大量的玉米种子堆积储存久了会散发热量。这两种能量转化分别是在玉米种子的哪一结构完成的[]A．细胞膜、细胞质B．叶绿体、线粒体C．细胞质、叶-七年级生物
• 阅读下面的短文，根据短文内容，完成短文后的填写表格任务。 Here are some suggestions on listening. We hope they can help you in on
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• 叶绿体能够利用____把水和____等合成有机物，有机物及其储存的____可以供给________利用，也可以直接或间接地供给____利用。-七年级生物
• 根据植物结构示意图，回答下列问题。(1)具有保护和支持细胞功能的是[]__________。(2)犹如细胞门户，凡是进出细胞的物质都要由此结构选择的是[]__________。(3)烟叶中的烟碱-七年
• 切割西瓜时，流出的汁液是____，它贮藏在细胞质中的__________中，在植物绿色部分的细胞中，细胞质内还有__________。-七年级生物
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• 吸烟有害健康，原因是烟草含有对人体有害的物质(尼古丁)，这种物质主要存在于烟草细胞中的[]A．细胞壁上B．液泡中C．细胞核内D．细胞质中-八年级生物
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• 食物中储存的化学能来自于光能的转化，这种转化主要是通过植物细胞中的哪种结构实现的?[]A．细胞核B．细胞膜C．叶绿体D．线粒体-八年级生物
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• 制作洋葱表皮临时装片时，下面操作正确的是[]A．用餐巾纸擦拭载玻片B．将洋葱块直接放置在显微镜下观察C．用镊子将取下的洋葱表皮在水滴中展平D．染色时掀开盖玻片，滴入染液-七年级生物
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• 在制作洋葱表皮细胞临时装片时，正确的做法是[]A．尽量将材料撕得薄B．将盖玻片垂直于载玻片后迅速放下C．如有气泡，则用手轻压赶出D．盖上盖玻片后，可直接将稀碘液滴在盖玻片上-七年级生物
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