如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:D→ (2006?长沙)如图是青蛙发育过程中某些阶段的示意图,据图...

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(1)青蛙微变态发育,如图 青蛙的发展过程包括受精卵(a)→蝌蚪【先长出外鳃→外鳃消失长出内鳃(b→c)】→蝌蚪长出后肢、前肢(d、e)→尾和内鳃逐渐萎缩消失,肺形成(f)→幼蛙(g)→成蛙(h).所以青蛙发育过程的顺序是D→B→C→E→A
(2)青蛙的呼吸器官是外鳃→内鳃→肺,皮肤辅助,图中的B用外鳃呼吸.
(3)们知道青蛙是典型的两栖动物.两栖动物的出现代表了从水生到陆生的过渡期.既有适应陆地生活的新的性状,又有从鱼类祖先继承下来的适应水生生活的性状.多数两栖动物需要在水中产卵,发育过程中有变态,幼体(蝌蚪)接近于鱼类,而成体可以在陆地生活,两栖动物为雌雄异体,体外受精(水中受精)卵生,生殖发育离不开水;幼体必须生活在水中,像一条小鱼,用鳃呼吸;成体既能生活在陆地上,又能生活在水中,用肺呼吸,兼用皮肤辅助呼吸
(4)如上图蝌蚪的形态和结构与成蛙的区别很大,青蛙的发育方式为变态发育
故答案为:(1)B→C→E→A
(2)外鳃(3)体外(4)变态



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