Which of the following is not a symbiotic nitrogen fixing bacterium?
Clostridium
Rhizobium leguminosarum
Frankia
Mycobacterium
Crop rotation is carried out for
Relation between bacteria and legume having nodulated roots is that of
Farmers have reported $50\%$ higher yield of rice by using biofertilizer
Azolla is used as a biofertiliser because it
Which of the following are the part or example of symbiotic mutualistic association?
$I.$ Yeast
$II.$ Rhizobium
$III.$ Mycorrhiza
$IV.$ Oscillatoria