There were more dark-winged moths before industrialization …

Chemistry NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 15 PCB Single Correct MCQ

Published on: August 14, 2026

There were more dark-winged moths before industrialization and more white-winged moths after industrialisation.
Choose the correct answer from the following:

The statement is true for dark-winged moths but false for white-winged moths.

The statement is true for both forms of moths.

The statement is false for dark-winged moths but true for white-winged moths.

The statement is false for both forms of moths.

Text Solution

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The correct answer is:

Before industrialisation, dark-winged moths (Biston betularia in its melanic form) were less common because they were more visible to predators against the light-colored bark of trees. After industrialisation, white-winged moths (the non-melanistic form) became less common due to pollution darkening the tree bark, making the dark-winged moths better camouflaged and thus more common.

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