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Question

What scenario does the following image explain?

I. Trees black due to             II. Trees in the forest light

industrialization                    colored


  1. Genetic variation and natural selection

  2. None of the above

  3. Evolution

  4. Effects of Industrialization


Solution

The correct option is A

Genetic variation and natural selection


The peppered moths are an excellent example of genetic variation and natural selection. During the Industrial Revolution of the 1800s in Europe, trees became darker with increasing deposition of soot. As a consequence, the lighter-colored moths that alighted on these trees became more visible to their predators - birds - and their numbers started declining. Conversely, there was an increase in the numbers of darker moths that survived as a result of being better camouflaged. This is not, an example of evolution as no new species was formed. All that happened was the ratios of differently colored moths of the same species changed.

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