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Gaokao Biology Practice Question

5.(3分)我国谚语中的“螳螂捕蝉,黄雀在后”体现了食物链的原理.若鹰迁 入了蝉,螳螂和黄雀所在的树林中,捕食黄雀并在栖息于林中,下列叙述正 确的是()

  1. A.鹰的迁入增加了该树林中蝉及其天敌的数量
  2. B.该生态系统中细菌产生的能量可流向生产者
  3. C.鹰的迁入增加了该生态系统能量消耗的环节
  4. D.鹰的迁入改变了该生态系统能量流动的方向

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