51. Major pollution causing agent is

1. 1. Hydrocarbon

   
   
   

   2. Animals

   
   
   

   3. Man

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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52. Pollution is

1. 1. Removal of top soil

   
   
   

   2. Release of toxic undesirable material in environment

   
   
   

   3. Conservation of energy

   
   
   

   4. All of above

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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