The common nitrogen­fixer in paddy fields is

  • [AIPMT 2010]
  • A

    Rhizobium

  • B

    Azospirillum

  • C

    Oscillatoria

  • D

    Frankia.

Similar Questions

Which of the following is free living aerobic and nonphotosynthetic nitrogen fixing bacterium

  • [AIPMT 1998]

What would happen if oxygen availability to activated sludge flocs is reduced ?

  • [AIIMS 2016]

$VAM$  represents

Identify correct option for micorrhiza

$(1)$ Many members of the genus glomusinvolved micorrhiza

$(2)$ It is responsible for all mineralsabsorption from the soil

$(3)$ Such associations show benefitsagainst draught and salinity in plants

$(4)$ Micorrhiza is a symbiotic relation ofalgae and plants

The main sources of biofertilisers are