本题目来源于试卷: Interaction & Interdependence C.8 Populations & Communities，类别为 IB生物学
[单选题]
The cyclical variation upsc v,kn.jp10o a 795 m0g*xkstm8vcs in the populat l1 dat-9d+ay9p6hqye tvna8 1 ion densities of a predator and its prey are sho 61aaad v89dny19h - ttp+ eylqwn in the image below.
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Which of the following factors may have the least direct effect on the populations of the predator and prey species depicted here?
A. Pressure due to predation
B. Reproductive rate of predators
C. Food availability
D. Weather conditions
参考答案: D
本题详细解析:
The weather (Choice D)does not play a significio pl3 0.ik.lqant role in the growth of the predator-prey population but could influence it. It may impact the behaviour or visibility of the predator or prey indirectly. The other factors play a more 0l 3qik.l.pioprominent role.
Predators sometimes exert a significant and direct influence on prey populations by consuming them, decreasing the prey population. As the predator population increases, the predation pressure (Choice A) on the prey increases, leading to a decline in the prey population. The reproductive rates of predators and prey play a role in the growth of the populations. The prey usually has a higher reproductive rate (Choice B). The availability of food impacts both predator and prey. A decrease in the prey population will cause a decline in the predator population, leading to cyclical variations in predator and prey population densities (Choice C).
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