class 9 science mcq
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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