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N(2)-fixing blue-green alga Anabaena whi...

`N_(2)`-fixing blue-green alga Anabaena which is extensively used in rice cultivation, forms symbiotic association with

A

Cycas roots

B

Azolla

C

Anthoceros

D

Alnus

Text Solution

Verified by Experts

The correct Answer is:
B
Symbiotic assiciation has been found between Anabaena (blue green alga) and Azolla (a water fern). Azolla pinnata has anabeana azollae in its fronds. It is often inoculated to rice fields for nitrogen fixationl. It is an efficient fertiliser of paddy fierlds. Estimates of the annual quantities of `N_(2)` fixed by Azolla range between 120 and 312 kg nitrogen per hactare.
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NCERT FINGERTIPS-MINERAL NUTRITION-Mineral Nutrition
  1. Select the mismatched pair.

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  2. Certain non-leguminous plants also form nodules to fix N(2). Example o...

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  3. N(2)-fixing blue-green alga Anabaena which is extensively used in rice...

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  4. The nodules present in the leguminous plants appear pink in colour due...

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  5. During nodule formation in leguminous plants, an infection thread is p...

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  6. Refer to the given figure and select the correct option.

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  7. Study the given figures carefully showing the development of root nodu...

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  8. What dows the given figure represent?

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  9. During N(2) fixation, reduction of one molecule of nitrogen into 2 mol...

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  10. Which one is the correct equation of nitrogen fixation?

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  11. The cofactor of nitrate reductase is

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  12. Leghaemoglobin is produced in response to

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  13. Which of the following statements is incorrect about leghaemoglobin?

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  14. conditions are created by leghaemoglobin in the root nodule of a legum...

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  15. Read the following statements and select the correct answer. (i). Rh...

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  16. Ammonia synthesis by nitrogenase requires

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  17. Read the following statements and select the incorrect ones. (i). Th...

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  18. Refer to the given reaction alpha-Ketoglutaric acid +NH(4)^(+)+NADPH...

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  19. Select the option which completes the given equation for reductive ami...

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  20. The process of transfer of amino group from one amino acid to the keto...

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