《有趣的食物链》课件2

有趣的食物联系请猜成语螳螂捕蝉黄雀在后“螳螂捕蝉，黄雀在后”说的是什么生物现象？柳叶讨论：这里的动物吃什么？它们有什么样的食物关系？大家按照谁被谁吃的顺序，用简单的文字或者箭头表示出来。蔷薇或小草蚜虫瓢虫小鸟落叶蚯蚓小鸟归纳生物之间这样一种像链环一样的食物关系，称为食物链。nantong.99114.com/pifa-107/nantong.99114.com/pifa-117/nantong.99114.com/pifa-115/nantong.99114.com/pifa-116/lianyungang.99114.com/pifa-128/lianyungang.99114.com/pifa-118/lianyungang.99114.com/pifa-125/lianyungang.99114.com/pifa-135/lianyungang.99114.com/pifa-131/lianyungang.99114.com/pifa-106/lianyungang.99114.com/pifa-136/lianyungang.99114.com/pifa-113/lianyungang.99114.com/pifa-140/lianyungang.99114.com/pifa-109/lianyungang.99114.com/pifa-103/lianyungang.99114.com/pifa-137/lianyungang.99114.com/pifa-129/lianyungang.99114.com/pifa-133/lianyungang.99114.com/pifa-126/lianyungang.99114.com/pifa-102/lianyungang.99114.com/pifa-127/lianyungang.99114.com/pifa-110/lianyungang.99114.com/pifa-114/lianyungang.99114.com/pifa-119/lianyungang.99114.com/pifa-130/lianyungang.99114.com/pifa-123/lianyungang.99114.com/pifa-122/lianyungang.99114.com/pifa-101/lianyungang.99114.com/pifa-105/lianyungang.99114.com/pifa-104/lianyungang.99114.com/pifa-107/lianyungang.99114.com/pifa-117/lianyungang.99114.com/pifa-115/lianyungang.99114.com/pifa-116/huaian.99114.com/pifa-128/huaian.99114.com/pifa-118/huaian.99114.com/pifa-125/huaian.99114.com/pifa-135/huaian.99114.com/pifa-131/huaian.99114.com/pifa-106/huaian.99114.com/pifa-136/huaian.99114.com/pifa-113/huaian.99114.com/pifa-140/huaian.99114.com/pifa-109/huaian.99114.com/pifa-103/huaian.99114.com/pifa-137/huaian.99114.com/pifa-129/huaian.99114.com/pifa-133/huaian.99114.com/pifa-124/huaian.99114.com/pifa-126/huaian.99114.com/pifa-102/huaian.99114.com/pifa-127/huaian.99114.com/pifa-110/huaian.99114.com/pifa-114/huaian.99114.com/pifa-119/huaian.99114.com/pifa-130/huaian.99114.com/pifa-123/huaian.99114.com/pifa-122/huaian.99114.com/pifa-101/huaian.99114.com/pifa-105/huaian.99114.com/pifa-104/huaian.99114.com/pifa-107/huaian.99114.com/pifa-117/huaian.99114.com/pifa-115/huaian.99114.com/pifa-116/yancheng.99114.com/pifa-128/yancheng.99114.com/pifa-118/yancheng.99114.com/pifa-125/yancheng.99114.com/pifa-135/yancheng.99114.com/pifa-131/yancheng.99114.com/pifa-106/yancheng.99114.com/pifa-136/yancheng.99114.com/pifa-113/yancheng.99114.com/pifa-140/yancheng.99114.com/pifa-109/yancheng.99114.com/pifa-103/yancheng.99114.com/pifa-137/yancheng.99114.com/pifa-129/yancheng.99114.com/pifa-133/yancheng.99114.com/pifa-124/yancheng.99114.com/pifa-126/yancheng.99114.com/pifa-102/yancheng.99114.com/pifa-127/yancheng.99114.com/pifa-110/yancheng.99114.com/pifa-114/yancheng.99114.com/pifa-119/yancheng.99114.com/pifa-130/yancheng.99114.com/pifa-123/yancheng.99114.com/pifa-122/yancheng.99114.com/pifa-101/yancheng.99114.com/pifa-105/yancheng.99114.com/pifa-104/yancheng.99114.com/pifa-107/yancheng.99114.com/pifa-117/yancheng.99114.com/pifa-115/yancheng.99114.com/pifa-116/yangzhou.99114.com/pifa-128/yangzhou.99114.com/pifa-118/yangzhou.99114.com/pifa-125/yangzhou.99114.com/pifa-135/生物之间这样一种像链环一样的食物关系，称为食物链。食物链生物之间这种像链环一样的食物关系叫食物链中能自己制造食物的生物叫生产者直接或者间接消费别人制造的食物的生物叫消费者食物链都是由绿色植物开始，到凶猛的肉食动物终止。生产者生产者生产者消费者消费者消费者消费者落叶蚯蚓小鸟食物链:1、用箭头表示吃与被吃的关系2、箭头指向吃者3、食物链至少包括三种动植物4、食物链从植物开始吃者①③②植物兔子青蛙蛇思考:下面两条食物链正确吗?为什么?落叶蚯蚓××2、箭头指向吃者3、食物链至少包括三种动植物4、食物链从植物开始1、吃与被吃的关系要合理观察这个生态系统中的生物，将不同生物之间吃与被吃的关系用箭头连接起来。草同一种植物会被不同的动物吃掉，同一种动物可以吃多种食物，生物之间这种复杂的食物关系形成了一个网状结构，叫做食物网。五十年代，我国农村曾把麻雀作为四害来消灭的运动。后来人们发现，在麻雀被大量捕杀之后的几年里，出现了严重的虫灾，使粮食大量减产。农民伯伯不明白这是为什么？谁给农民伯伯解释一下，这是怎么回事？食物链被破坏带来的后果大家来计算一条蛇每年可以吃掉60只田鼠，一只田鼠一年糟蹋5kg粮食。据统计人类每年吃掉1000吨蛇，如果每条蛇重0.5kg，那么一年下来，等于放走了多少只田鼠？损失多少粮食？