What was the reason for the reversal of proportion in the moth population?

What was the reason for the reversal of proportion in the moth population?
  1. Industrialisation
  2. Climate change
  3. Pollution
  4. Pesticide use

Solution

During the post industrialisation period, the tree trunks became dark due to industrial smoke and soots. Under this condition the white-winged moth did not survive due to predators, dark-winged or melanised moths.

Asked in: NCERT

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