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Solution


Q.

Read the passage given below and answer the following questions from (i) to (v):

The amount of ozone in the atmosphere has begun to drop sharply from 1980s. This decrease has been linked to synthetic chemicals. In 1987, the United Nations Environment Programme (UNEP) succeeded in forging an agreement to freeze harmful chemicals production at 1986 levels.

 

(iv) Which of the following sources is responsible for the depletion of ozone layer
1  
2
3  
4 All of the above  

Ans.

(4)