21. Among pollutants which has the most lasting effect

1. 1. Carbon monoxide

   
   
   

   2. Pesticides

   
   
   

   3. Sulphur dioxide

   
   
   

   4. Smoke from chimnery

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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22. Which of the following Scientists has established the 'Phylum Annelida' ?

1. 1. Linnaeus

   
   
   

   2. Lamark

   
   
   

   3. Aristotle

   
   
   

   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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23. Scientist who laid the foundation of bacteriology

1. 1. Leeuwenhock

   
   
   

   2. Loius Pasteure

   
   
   

   3. Willam Hervey

   
   
   

   4. Edward Jenner

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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24. Scientist who crystallised virus for the first time

1. 1. Waksman

   
   
   

   2. Watson

   
   
   

   3. Stanley

   
   
   

   4. Emerson

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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25. Who discover the causal organism of the disease Anthrax

1. 1. Louis Pasteure

   
   
   

   2. Robert Koch

   
   
   

   3. Mendel

   
   
   

   4. Fleming

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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