下列能正确表达植物细胞内各结构之间位置关系的是[]A．图ⅠB．图ⅡC．图ⅢD．图Ⅳ-七年级生物

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• 某生物小组的同学绘制了4幅植物细胞结构简图，请判断哪一幅图更准确[]A．B．C．D．-七年级生物
• 观察洋葱鳞片叶内表皮细胞时，正确的实验顺序是①染色；②盖上盖玻片；③把撕取的内表皮平整地展开在清水滴中；④用镊子撕取一小片洋葱鳞片叶内表皮；⑤在载玻片中央滴一滴清水；-七年级生物
• 制作临时装片时，如果没有大蒜蒜瓣，可供选择的代替材料是[]A．纸片B．塑料薄膜C．洋葱D．以上均可-七年级生物
• 下列关于植物体的组成和细胞结构的叙述不正确的是[]A．切西瓜时流出的汁液是细胞液B．植物的叶绿体位于液泡内C．表皮破损的番茄很快腐烂是保护组织遭到破坏的缘故D．植物体的各种-七年级生物
• 完形填空。How can you think in English? I think the best way is to practice as what a football player doe
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• 叶绿体能将光能转化为化学能，线粒体能将有机物中的化学能释放出来供细胞利用，这说明_________和___________都是细胞中的能量转换器。-七年级生物
• 如图所示是列文·虎克当年使用的显微镜。据图回答问题：(1)与现在的显微镜比较，列文·虎克当年使用的这台显微镜尽管比较简单，但是，它却有相应的基本结构。请在图中标注“目镜-七年级生物
• 将青菜叶子放在稀释的红墨水中，可以通过探究活动来判断叶子的细胞是死、是活，这和细胞的什么结构有关？[]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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• 阅读理解。 Dreams may be more important than sleep. Some people don't need very much sleep. But we a
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• 夏天吃糖拌番茄，父母疼爱孩子，总把剩下的番茄汁液留给孩子，认为这些汁液是营养精华。请你从科学的角度进行判断，这种观点对否？为什么？-七年级生物
• 经检测发现：栽培在受化学物质苯甲酸污染的土壤里的玉米幼苗，其体内苯甲酸的含量并不高。那么，是什么结构阻挡了苯甲酸进入植物细胞？[]A．细胞质B．细胞壁C．细胞膜D．液泡膜-七年级生物
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• 在制作蚕豆叶临时切片时，我们怎样把切下的薄片放到清水中或放到载玻片上？[]A．用毛笔B．用剪子C．用镊子D．用指尖-七年级生物
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• 用低倍镜观察洋葱表皮细胞时，可看到的细胞结构包括[]A．细胞壁、细胞核、叶绿体B．细胞核、叶绿体、线粒体C．细胞核、液泡、线粒体D．细胞壁、细胞核、液泡-七年级生物
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• 连线题①细胞膜A．遗传信息库②叶绿体B．动力车间③线粒体C．控制物质进出④细胞核D．将光能转变成化学能⑤染色体E．支持和保护作用⑥细胞壁F．传递遗传信息-七年级生物
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• 制作洋葱内表皮细胞临时装片时，染色可更清楚地观察细胞结构。通常使用的染液是[]A．蒸馏水B．清水C．生理盐水D．碘液-七年级生物
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