class 8 science mcq
20 The micro organism "plasmodium" causes
1. t.b
2. typhoid
3. malaria
4. polio
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19 Disease causing micro organisms are
1. vectors
2. pathgen
3. microbes
4. all
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18 The milkmaids who developed cowpox develop immunity to
1. typhoid
2. smallpox
3. t.b
4. all
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17 Small pox vaccine is invented by
1. edward jenner
2. ronald ross
3. louis pasteur
4. albert sabin
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