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Which of the following is a free-living ...

Which of the following is a free-living nitrogen fixing bacterium present in the soil ?

A

Nitrosomonas

B

Rhizobium

C

Pseudomonas

D

Azotobacter

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The correct Answer is:
D
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MODERN PUBLICATION-ECOSYSTEM -COMPETITION FILE (OBJECTIVE TYPE QUESTIONS)(A. MULTIPLE CHOICE QUESTIONS)
  1. In an aquatic ecosystem, the trophic level equivalent to cows in grass...

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  2. Deserts , grasslands, forests and tundra are the examples of :

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  3. Which of the following is a free-living nitrogen fixing bacterium pres...

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  4. In plant succession, when climax community is reached, the net product...

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  5. Study the four statement (i-iv) given below and select the two correct...

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  6. The biomass available for consumption by the herbivores and the decomp...

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  7. One of the free nitrogen - fixed in paddy fields is :

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  8. the common nitrogen - fixer in paddy fields is

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  9. Which one of the following is one of the characteristics of a biologic...

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  10. Which one of the following is most appropriately defined?

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  11. Study the cycle shown in Fig. 12.7 and select the option which gives c...

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  12. Which of the ecological pyramids is always upright ?

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  13. Population are said to be sympatric when

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  14. A large regional unit characterised by vegetation type and associated ...

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  15. In primary succession on rocks, the pioneer species are usually:

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  16. The ''10 per cent law'' is related to:

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  17. A phenomenon when a parasite parasitizes another parasite is known as ...

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  18. The type of ecosystem with the highest mean plant productivity is :

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  19. Bell-shaped polygonal pyramid indicates.

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  20. The transition zone between two communities is known as:

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