class 8 science chapter 3 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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he 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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16 Micro organisms present in root nodules of leguminous plants
1. rhizobium
2. bacillus
3. azatobactor
4. nostoc
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15 These micro organisms fixes atmospheric nitrogen in the soil
1. rhizobium
2. nostoc, anabina
3. azatobactor
4. all
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14 Nitrogen gas is present in the air around
1. 21%
2. 58%
3. 68%
4. 78%
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13 The word vaccine comes from 'vaca' which means
1. cow
2. ox
3. hen
4. calf
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12 When a vaccine is given, that contains
1. weak micro organisms
2. killed micro organisms
3. 1 and 2
4. living micro organisms
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11 This protect us from getting the diseases over a long period of time
1. antibiotic
2. injection
3. vaccine
4. tablets
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