全国各地中考真题:甘肃省白银市2018年中考生物真题试题(含解析)
甘肃省白银市2018年中考生物真题试题一、选择题(本大题共6小题,共12.0分)1.在自然生态系统中,生物种类越多,食物链和食物网越复杂,其自我调节能力越强。下列生态系统中,自我调节能力最强的是( )A.农田生态系统B.森林生态系统C.草原生态系统D.池塘生态系统【答案】B【解析】解:生态系统的调节能力取决于生态系统中的生物的种类,生物种类越多,营养结构越复杂,自我调节能力越强,在农田生态系统。森林生态系统、草原生态系统和池塘生态系统中,森林生态系统中的生物种类最多,所以自我调节能力最强故选:B。在生物圈中,由于不同地域的环境差别很大,生物种类也是千差万别,因此,生物圈中有着多种多样的生态系...
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