第二章测试
1.For fish growth in the aquatic ecosystem, dissolved oxygen is a( )。
A:general  ecological factor B:biotic factor C:limiting factor D:abiotic factor
答案:C
2.Which of the following factors is not the limiting factor for fish growth in the aquatic ecosystem?( )
A:Silt B:DO C:Soil nutrients D:Temperature 3.Humans raising cattle for food is what kind of relationship?( )
A:mutualism B:intraspecific competition C:predation D:parasitism 4.Which is the abiotic factor of an organism’s environment?( )
A:plants B:fungi C:bacteria D:weather 5.Which is not the typical habitat of mosses?( )
A:moist B:shady C:drought D:cool

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