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  • (a) Describe the observations made on collection of white winged moths and dark winged moths in England between the years 1850 and 1920. What did these observations lead to ? (b) How is the use of herbicides, pesticides and antibiotics b

(a) Describe the observations made on collection of white winged moths and dark winged moths in England between the years 1850 and 1920. What did these observations lead to ?

(b) How is the use of herbicides, pesticides and antibiotics by humans for various purposes, comparable with the observations made on moths in the above question ? What is this type of phenomenon called ?

 

 
 
 
 
 
 
 
 
 

Answers (1)

a) Before industrialisation tree bark were covered with light coloured lichens, this background white-winged moth survived but dark coloured moth was picked out by predators, post industrialisation tree trunks converted dark due to industrial smoke and soot, under this situation the white-winged moth did not survive due to predators, while the dark-winged/melanised moth survived, this showed that organism that is better adapted to survive are selected by Nature/Natural selection.

b) Excessive use of these chemicals has resulted in the selection of resistant varieties, in a much lesser time.

This type of phenomenon is called anthropogenic action.

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Safeer PP

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