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A nitrogen fixing microbe associated wit...

A nitrogen fixing microbe associated with the fern Azolla in rice fields is

A

Frankia

B

Rhizobium

C

Spirunlina

D

Anabaena

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The correct Answer is:
D
Anabaena azollae, a cyanobacterium that lives in symbiotic association with the free folating water ferm Azolla. Anabaena azollae can grow photo-autotrophically and fixed atmospheric nitrogen. The inoculation of cyanobacteria in rice crop significantly influences the growth of rice crop by secretion of ammonia in flood water.
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  2. Cyanobacteria are

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  4. Azolla pinnata has been found to be an important biofertiliser for pad...

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  7. Which of the following statements is/are correct ?

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  8. Which of the following options includes biofertilisers ?

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  9. Which of the following is a non-symbiotic biofertiliser ?

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  10. Nitrogen fixation in root nodules of Alnus is brought about by

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  11. Farmers have reported over 50% higher yields of rice by using which of...

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  12. Match column I with column II and select the correct answer from the g...

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  13. Which of the followig statements is/are incorrect ? (i) Cyanobacteri...

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  14. Match column I with column II and select the correct answer from the g...

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  15. Which of the following curves correctly represents the process of anti...

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