31. The process which does not evolve CO₂ in air is

1. 1. burning

   
   
   

   2. breathing

   
   
   

   3. organic delay

   
   
   

   4. photosynthesis

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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32. Most poisonous pollutant in water is

1. 1. zinc

   
   
   

   2. phosphate

   
   
   

   3. arsenic

   
   
   

   4. detergent

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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33. High concentration hydrocarbon pollutants in atmospheric air causes

1. 1. cancer

   
   
   

   2. silicosis

   
   
   

   3. respiratory diseases (e.g.asthma)

   
   
   

   4. reduced crop yield

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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34. Which of the following pollutants is main product of automobile exhaust ?

1. 1. CO

   
   
   

   2. CO₂

   
   
   

   3. NO

   
   
   

   4. Hydrocarbons

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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35. Lead in water can cause

1. 1. Eye disease

   
   
   

   2. Kidney disease

   
   
   

   3. Hair fall

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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