Historically, island species have tended to become extinct …

Biology Biodiversity and Conservation NCERT Single Correct MCQ

Published on: August 13, 2026

Historically, island species have tended to become extinct faster than species living on a mainland. Which of the following reasons can not be used to explain this phenomenon?

Island species have often evolved in the absence of predators and have no natural avoidance strategies.

Humans have introduced diseases and competitors to islands, which negatively impacts island populations.

Island populations are-usually smaller than mainland populations.

Island populations are usually less fit than mainland populations

Text Solution

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The correct answer is:

, , and are valid reasons:

Lack of predators → poor defense

Introduction of new species/diseases → harmful

Small population size → higher extinction risk

is incorrect because island species are not necessarily less fit; they are just more vulnerable to changes.

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