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प्रश्न
Why did tree trunks become dark after industrialisation?
विकल्प
Industrial smoke and soot darkened the tree trunks.
Thick growth of almost white-coloured lichens darkened the trunks.
White-winged moths produced dark pigments on trunks.
Gill slits developed on the trunks.
MCQ
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उत्तर
After industrialisation, industrial smoke and soot made tree trunks dark. This changed the background against which moths were seen by predators.
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