本题目来源于试卷: Unity and Diversity A.9 Conservation of Biodiversity，类别为 IB生物学
[单选题]
What is an example of an emergent lsbh 07xi:t8o prop x a2ha cj:t,d15g wdhs360 vgkerty?
A. Increases biodiversity because there are more species in the ecosystem
B. Decreases biodiversity as the invasive species outcompetes native species for resources
C. Decreases biodiversity as new plants encourage new insects and animals to immigrate to the ecosystem
D. Increases biodiversity as the invasive species brings new pests into the ecosystem
参考答案: B
本题详细解析:
Invasive species are species that arrive in an ecosystem to whico+5orj* g6q wxh they are not endemic to and they often lack natural population controls such as herbivores or predators. They therefore sometimes outcompete native species for resources which can decrease biodiversity. Choice B is correct.Choice A is incorrect, as introducing an invasive species usually reduces biodiversity. There are many reasons for this, including competition with native species, predation, herbivory, habitat alteration and the introduction of disease. Choice C is incorrect as although new plants may encourage new insects and plants to immigrate into an area, this would increase biodiversity, not decrease it. Choice D is incorrect because although invasive species can bring new pests,r* owj+g qo5x6 these pests often reduce biodiversity by decimating native populations.
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