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Question

Which among the following statements is/are true regarding Industrial Melanism?


A

A change in an environment can result in evolution of species in that area.

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B

Dark moths survived as they were naturally selected.

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C

Light moths survived as they were naturally selected.

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D

The environment near these cities have always favoured the growth of all moths.

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Solution

The correct options are
A

A change in an environment can result in evolution of species in that area.


B

Dark moths survived as they were naturally selected.


There were two different types of moths one that was lightly coloured with spots on their wings and the other with darker wings in the area of Manchester. Manchester generally had very few darkly coloured moths as they were easily identified among the green lichens and preyed on by the birds. Soon after the industrial revolution in Manchester, the dust and black soot in the atmosphere settled on the tree trunks and killed the lichens. Now, this condition favoured the darkly coloured moths as they were not visible to the birds. The light ones were preyed on eventually causing a fall in the population of lightly coloured moths and an increase in the population of dark moths.


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