精選初二上冊生物知識點(diǎn)：動物的主要類群（第五單元）

1、.精選初二上冊生物知識點(diǎn)：動物的主要類群第五單元學(xué)習(xí)是一個循序漸進(jìn)的過程，也是一個不斷積累不斷創(chuàng)新的過程。下面小編為大家整理了精選初二上冊生物知識點(diǎn)：動物的主要類群第五單元，歡送大家參考閱讀!一、蚯蚓屬于環(huán)節(jié)動物。1.身體分節(jié)，可以增強(qiáng)運(yùn)動的靈敏性，通過肌肉和剛毛來完成運(yùn)動。2.體壁分泌黏液，保持潮濕以保證呼吸。3.環(huán)節(jié)動物的特征：身體由許多相似的體節(jié)構(gòu)成。4.常見種類：蚯蚓、水 蛭等。二、蝗蟲是節(jié)肢動物的代表。1.蝗蟲構(gòu)造：身體 分為頭部、胸部、腹部三部分，體表堅硬具有外骨骼運(yùn)動構(gòu)造：三對足，兩對翅，后足興隆適于跳躍，前翅革質(zhì)起保護(hù)作用，后翅膜質(zhì)合適飛翔。感覺構(gòu)造：一對復(fù)眼，三個單眼，觸角分

2、節(jié)。呼吸構(gòu)造：進(jìn)出氣體的構(gòu)造為氣門。2.節(jié)肢動物的特征：身體分部，軀體、足和觸角分節(jié)，體表具有外骨骼。3.節(jié)肢動物適于陸地生活的原因：體表有外骨骼 , 運(yùn)動器官興隆等。三、魚類鯽魚1.身體呈梭形，合適游泳。2.體表具有鱗片;背部體色深灰黑色，腹部白色，是一種保護(hù)色。3.用鰓呼吸，用鰭游泳。4.側(cè)線作用：感知水流測定方向。四、鳥類1.體形：流線型。2.飛行器官：前肢特化為翼。3.肌肉：胸肌興隆。4.骨骼：具有龍骨突，有的骨中空，有的骨愈合。5.消化：消化系統(tǒng)興隆，直腸極短。6.呼吸方式：雙重呼吸，用肺呼吸，氣囊輔助呼吸。7.體溫：恒定。五、哺乳動物1 .體表：被毛，保溫有作用。2.體腔：有膈，將

3、體腔分為胸腔和腹腔。3.牙齒：分為門齒和臼齒，適于切斷、磨碎食物。4.呼吸：用肺呼吸。5.體溫：恒定。6.神經(jīng)系統(tǒng)：由腦、脊髓和神經(jīng)組成，大腦興隆。以上就是查字典生物網(wǎng)為大家整理的精選初二上冊生物知識點(diǎn)：動物的主要類群第五單元，怎么樣，大家還滿意嗎?希望對大家的學(xué)習(xí)有所幫助，同時也祝大家學(xué)習(xí)進(jìn)步，考試順利!ectable="on" role="presentation" style="padding: 1px 3px; margin: 0px; font-family: Arial, sans-serif; border-width: 0px

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