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PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO初一科学第二册第六章第二节PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPROPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPROPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPROPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPROPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPROPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPROPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPROPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPROPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPROPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPROPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPROPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPROPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO蚕豆樟树月季小麦竹大蒜苔藓玉米银杏蕨松水绵（藻类）PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO植物体------------------------------------------？PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO蚕豆樟树小麦竹月季玉米银杏松大蒜PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO种子植物------------------------------------------？PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPROPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO蚕豆竹樟树月季大蒜玉米小麦被子植物PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPROPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO松银杏柏铁树裸子植物PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO被子植物------------------------------------------？PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO蚕豆竹樟树月季大蒜玉米水稻被子植物PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPROPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO种皮和果皮子叶PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO观察种子：a.用镊子把蚕豆的种皮剥下,小心地把豆瓣掰开，观察子叶。b.用镊子把玉米果皮和种皮剥下，用放大镜观察玉米种子的子叶。PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO双子叶植物和单子叶植物双子叶植物:种子具有两片子叶的植物单子叶植物:种子具有一片子叶的植物PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO花叶茎根被子植物具有根、茎、叶、花、果实、种子。想一想：单子叶植物和双子叶植物可以根据植物的种子来区分，那么植物的其他器官是否也能作为区分单子叶和双子叶植物的依据呢？PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO探究：双子叶植物和单子叶植物的区别双子叶植物单子叶植物子叶根叶花茎代表植物2枚1枚蚕豆、芹菜、萝卜、樟树水稻、玉米、大蒜、葱菠菜葱PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO直根系须根系PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO探究：双子叶植物和单子叶植物的区别双子叶植物单子叶植物子叶根叶花茎代表植物2枚1枚直根系须根系蚕豆、芹菜、萝卜、樟树水稻、玉米、大蒜、葱PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO探究：双子叶植物和单子叶植物的区别双子叶植物单子叶植物子叶根叶花茎代表植物2枚1枚直根系须根系网状叶脉平行叶脉蚕豆、芹菜、萝卜、樟树水稻、玉米、大蒜、葱PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO碗豆桃花梅花水仙油菜花韭菜花PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO探究：双子叶植物和单子叶植物的区别双子叶植物单子叶植物子叶根叶花茎代表植物2枚1枚直根系须根系易剥皮，一般树木的茎能增粗，有形成层不易剥皮，一般不能增粗或增粗不明显，无形成层网状叶脉平行叶脉花的各部分基数是5或4花的各部分基数是3蚕豆、芹菜、萝卜、樟树水稻、玉米、大蒜、葱PresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO画一画:根据花或叶的特点猜想它们的植株ABPresentedByPresentedByHarryMills/HarryMills/PRESENTATIONPROPRESENTATIONPRO活动：与蔬菜交朋友植物名称食用部位双（单）子叶植物判断理由