Multiple Choice
In a laboratory simulation of natural selection in insects, which factor would most likely increase the frequency of a particular trait in the population over several generations?
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1. Introduction to Biology
Natural Selection and Evolution
Multiple Choice
Which of the following is NOT an essential characteristic of a keystone species?
A
It has a disproportionately large effect on its ecosystem relative to its abundance.
B
It plays a critical role in maintaining the diversity of its community.
C
It is always the most abundant species in the ecosystem.
D
Its removal can lead to significant changes in community structure.
Verified step by step guidance1
Step 1: Begin by understanding the concept of a keystone species. A keystone species is one that has a disproportionately large impact on its ecosystem relative to its abundance. It plays a critical role in maintaining the structure and diversity of the community.
Step 2: Analyze the characteristics provided in the question. The first characteristic states that a keystone species has a disproportionately large effect on its ecosystem relative to its abundance. This aligns with the definition of a keystone species.
Step 3: Evaluate the second characteristic, which mentions that a keystone species plays a critical role in maintaining the diversity of its community. This is also consistent with the role of a keystone species.
Step 4: Examine the third characteristic, which states that a keystone species is always the most abundant species in the ecosystem. This is incorrect because keystone species are not defined by their abundance but by their ecological impact.
Step 5: Consider the fourth characteristic, which states that the removal of a keystone species can lead to significant changes in community structure. This is true, as the absence of a keystone species often disrupts the balance of the ecosystem.
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