Which of the following are the part or example of symbiotic mutualistic association?
$I.$ Yeast
$II.$ Rhizobium
$III.$ Mycorrhiza
$IV.$ Oscillatoria
$I$ and $II$
$I$ and $III$
$II$ and $III$
$III$ and $IV$
Azolla is used as a biofertiliser because it
Farmers have reported over $50\%$ higher yields of rice by using which of the following biofertilizer
Among the following pairs of microbes, which pair has both the microbes that can be used as biofertilizers?
$VAM$ represents