蛙和鸡的发育都属于变态发育。[]-八年级生物

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• 下图是青蛙发育过程中某些阶段的示意图，据图回答下列问题：(1)青蛙发育过程的顺序是________（用字母和箭头表示）。(2)图中的B用______(填“外鳃”或“肺”)呼吸。(3)图中的B进一步-八
• 见过青蛙吗？青蛙的发展过程包括四个阶段，顺序是①受精卵②成蛙③蝌蚪④幼蛙[]A．①④③②B．①③④②C．①②③④D．①③②④-八年级生物
• 两栖动物不能完全适于陆地生活，主要原因是[]A．两栖动物的体温不恒定B．两栖动物的生殖发育离不开水C．两栖动物的心室中有混合血D．两栖动物的肺发育不善-八年级生物
• 两栖动物的生殖和幼体发育必须在______中进行，幼体要经过________发育才能上陆生活。-八年级生物
• 蛙的受精方式与胚胎发育方式分别为[]A．体内受精，卵生B．体外受精，胎生C．体内受精，胎生D．体外受精，卵生-八年级生物
• 对于蛙、蝾螈等两栖动物的“两栖”，我们可以理解为[]A．皮肤裸露有花纹的动物B．成体既可以在水中生活，也可以在陆地上生活C．幼体在水中发育，成体营水陆两栖D．具有变态发育的动-八年级生物
• 下列行为中，不属于雄蛙为能有大量的后代并且提高后代的存活率而必须在繁殖季节进行的行为是[]A．全力鸣叫B．抱住排卵前的雌蛙C．选择水源充沛、水质良好的场所D．筑巢-八年级生物
• “黄梅时节家家雨，青草池塘处处蛙。”春末夏初，青蛙“呱、呱、呱”的叫声此起彼伏。如果寻声找去，你会发现池塘中的青蛙正在抱对。不久以后你再来，会在水中看到小蝌蚪。如果你-八年级生物
• 与蝌蚪相比，只有成蛙才具有的结构是[]A．鳃B．尾C．肺D．心脏-八年级生物
• 青蛙、蟾蜍等两栖动物一次产卵成千上万枚，而鸟类一窝卵也只有几个，这是否说明两栖类比鸟类在生殖方面占优势呢？请说明理由。-八年级生物
• 请分析回答下列有关青蛙生殖发育及结构功能的问题：（1）在宋朝诗人赵师秀的“黄梅时节家家雨，青草池塘处处蛙”诗句中，“雨”和“蛙”的内在联系有：青蛙的受精方式为___________，发-八年级生物
• “蛙声一片”形容青蛙鸣叫响亮，那么，鸣叫的青蛙是[]A．雌蛙B．雄蛙C．雌雄蛙D．无法判断-八年级生物
• 鸣叫的青蛙是______性的，它的口角边有一对鸣囊。在青蛙抱对的池塘水面，会发现漂浮着的一片片胶状透明物，这是青蛙的卵块，里面有许多________。-八年级生物
• 青蛙的生殖方式是[]A．体外受精，卵生B．体外受精，变态发育C．体内受精，卵生D．体内受精，变态发育-八年级生物
• 青蛙和大豆个体发育的起点分别是[]A．受精卵、受精卵B．蝌蚪、种子C．蝌蚪、花粉粒D．受精卵、种子-八年级生物
• 将鸟受精卵的下列结构与其功能用线连接起来。①卵壳②卵壳膜A．将来发育为雏鸟③胚盘B．保护作用④卵白C．供给胚胎发育所需要的营养物质⑤卵黄-八年级生物
• 两栖动物的幼体发育成成体要经过[]A．变态发育B．不完全变态发育C．完全变态发育D．完全变态和不完全变态发育-八年级生物
• 两栖动物的生殖和幼体发育必须在______中进行，幼体到成体要经过_______发育。-八年级生物
• 对蛙的生殖发育有直接影响的是[]A．空气污染B．噪声污染C．水质污染D．固体废弃物污染-八年级生物
• 雌蛙与雄蛙之间抱对的意义是[]A．捉住雌蛙，防止雌蛙逃走B．培养感情，建立起相对稳定的配偶关系C．雌蛙与雄蛙之间的识别D．雌蛙和雄蛙同时排出生殖细胞，提高受精卵形成的机率-八年级生物
• 下表是某生物兴趣小组人工孵化蛙卵的实验记录：(1)乙组孵化率低的原因有两个：一是自来水中有氯气等物质对蛙的胚胎有__________作用，二是________低。(2)采取哪些措施可提高乙-八年级生物
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