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the common nitrogen - fixer in paddy...

the common nitrogen - fixer in paddy fields is

A

Rhizobium

B

Azospirillum

C

Oscillatoria

D

Frankie

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The correct Answer is:
B
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MODERN PUBLICATION-ECOSYSTEM -COMPETITION FILE (OBJECTIVE TYPE QUESTIONS)(A. MULTIPLE CHOICE QUESTIONS)
  1. The biomass available for consumption by the herbivores and the decomp...

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

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  3. the common nitrogen - fixer in paddy fields is

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

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

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

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  7. Which of the ecological pyramids is always upright ?

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  8. Population are said to be sympatric when

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

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

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

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

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

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  14. Bell-shaped polygonal pyramid indicates.

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

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  16. In India, tropical rain forests occur in

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  17. Which one of the following is a denitrifying bacterium ?

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  18. Some of the nutrient cycles are labelled as below. 1. Sulphur cycle...

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  19. Which of the following statements regarding decomposition is false?

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  20. Barnacles growing on the back of whale is an example for :

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