With the help of any two suitable examples explain the effect of anthr

1.	With the help of any two suitable examples explain the effect of anthropogenic actions on organic evolution.
Answer» Industrial melanism: • In England, before industrialisation, white-winged moths were more in number than darkwinged moths. • But after industrialisation, dark-winged moths became more in number than whitewinged moths. • This is because during industrialisation, the tree trunks covered by white lichens became dark due to deposition of dust and coal particles. • As a result, white-winged moths could be easily picked up by predators from the dark background and dark-winged moths survived . Chemical resistance: • Excessive use of herbicides and pesticides has resulted in evolution of resistant varieties of microbes in much lesser time scale. • As a result, pathogenic bacteria are appearing in very short period.

With the help of any two suitable examples explain the effect of anthropogenic actions on organic evolution.

Answer»

Industrial melanism:

• In England, before industrialisation, white-winged moths were more in number than darkwinged moths.

• But after industrialisation, dark-winged moths became more in number than whitewinged moths.

• This is because during industrialisation, the tree trunks covered by white lichens became dark due to deposition of dust and coal particles.

• As a result, white-winged moths could be easily picked up by predators from the dark background and dark-winged moths survived .

Chemical resistance:

• Excessive use of herbicides and pesticides has resulted in evolution of resistant varieties of microbes in much lesser time scale.

• As a result, pathogenic bacteria are appearing in very short period.

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