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The process of nitrogen-fixation by bact...

The process of nitrogen-fixation by bacteria does not take place in the presence of

A

molecular form of hydrogen

B

elemental form of oxygen

C

water

D

elemental form nitrogen

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The correct Answer is:
B
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PRADEEP-NATURAL RESOURCES : OUR ENVIRONMENT-NCERT EXEMPLAR PROBLEMS
  1. One of the following factors does not lead to soil formation in nature

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  2. The two forms of oxygen found in the atmosphere are

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  3. The process of nitrogen-fixation by bacteria does not take place in th...

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  4. Rainfall patterns depend on

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  5. Among the given options, which one is not correct for the use of large...

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  6. The nitrogen molecules present in air can be converted into nitrates a...

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  7. One of the following processes is not a step incolved in the water-cyc...

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  8. The term "water-pollution" can be defined in several ways. Which of th...

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  9. Which of the following is not a green house gas ?

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  10. Which step is not involved in the carbon-cycle ?

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  11. Ozone-hole' means

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  12. Ozone layer is getting depleted because of

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  13. Which of the following is a recently originated problem of environment...

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  14. When we breathe in air, nitrogen also goes inside along with oxygen. W...

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  15. Top soil contains the following

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  16. Choose the correct sequences

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  17. Major source of mineral in soil is the

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  18. Total earth's surface covered by water is

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  19. Biotic component of biosphere is not constituted by

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  20. An increase in carbondioxide content in the atmosphere would not cause

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