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

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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
• 阅读理解。 A good way to pass an exam is to work hard every day in a year. You may fail in an exam if you
• 阅读理解。 The class in America is almost the same as that in China. But something is different.(1) In Am
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• 任务型阅读。 New rules and behavior standards (规范) for middle school students came out in March. Who are t
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• 据细胞结构图回答问题：（1）下图中属于植物细胞结构的是_______图，属于动物细胞的是______图。从图中可以看出，植物细胞与动物细胞共同具有的结构是_____________。（2）其中能-七年
• 阅读理解。 It's 2009. You feel sick, so you go to the doctor. She checks your fever, looks at your t
• 根据短文内容判断正误。正确的在括号中写“T”，错误的写“F”。 Robots seem very new to most people. But they have a long history. T
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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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• 植物体上的绿叶，嫩茎等部分的细胞中的细胞质里含有一些绿色小颗粒叫__________，__________内含有__________等色素。-七年级生物
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• 阅读理解。 Not long ago, Richard Denniston found himself suffering the same pain that millions of other p
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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
• 植物细胞中，具有控制物质进出作用的结构是[]A．细胞壁B．细胞膜C．细胞质D．细胞核-七年级生物
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• 制作洋葱表皮细胞临时装片的正确顺序是[]A．撕取内表皮、滴清水、染色、盖盖玻片B．撕取内表皮、滴清水、放置材料、盖盖玻片、染色C．滴清水、撕取内表皮、放置材料、染色、盖盖-七年级生物
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• 植物细胞既可以________，也可以________，这主要取决于细胞________水溶液的浓度和________浓度的大小。当周围水溶液的浓度________细胞液浓度时，细胞就失水；当细胞液浓
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• 将菠菜泡在开水中，开水会变绿，而把菠菜泡在冷水中，水不会变绿，这是因为开水破坏了细胞的[]A．细胞壁B．细胞膜C．细胞质D．细胞核-八年级生物
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• 阅读下列材料，从所给的A-F六个选项中，选出正确的选项填空，使短文通顺、内容完整。 Bears are found in Asia, Africa and America. They are very
• 阅读理解。 As we know, it is difficult for parents of every family to teach their children to be responsi
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• A．细胞壁①控制物质进出B．细胞膜②遗传的控制中心C．液泡③支持保护作用D．细胞核④光合作用场所E．叶绿体⑤内含细胞液-八年级生物