问题 实验题

下图为草原生态系统请根据图回答问题: (共7分)

(1)图中生产者是       

(2)鼠、兔、蛇、狐、鹰都是动物,统称为      者。

(3)图中有    条食物链。

(4)如果狐大量减少,那么鼠和兔将会           

(5)如果受到DDT污染,体内DDT含量最高的生物是         

(6)写出其中一条食物链:(2分)________________________________________________

答案

(1)草 (2)消费  (3)5 (4)急剧增加   (5)鹰(6)草→鼠→鹰

题目分析:(1)(2)在生态系统中,植物能够通过光合作用制造有机物,并将光能储存在有机物中,为自身和其他生物提供了食物和能量,因此植物是生态系统中的生产者,动物不能自己制造有机物,它们直接或间接以植物为食,随着摄食,食物中的物质和能量也进入动物体内,因此动物是生态系统的消费者;

(3)(6)一条完整的食物链,从生产者开始,到本条食物链的最高消费者结束,图中的食物链有:草→兔→鹰,草→兔→狐,草→鼠→蛇→鹰,草→鼠→鹰,草→鼠→狐共五条食物链;

(4)在食物链中,任何一种生物数量的变化,都会引起生态系统其他生物数量的变化,若大量捕猎狐狸,野兔和鼠就会因失去天敌的控制而数量增加;

(5)有毒物质在生物体内不易被排出和分解,随着食物链逐级积累,DDT作为一种剧毒物质,会沿着食物链传递并逐渐积累,而鹰的营养级别最高,所以鹰的体内DDT的含量最多。

解答题
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