question

(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 ?

 

 

 

 

 

 

 

 

 

 

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.