Relation between bacteria and legume having nodulated roots is that of
Host-parasitism
Commensalism
Symbiosis
Epiphytism
Which is correct
Aquatic fern which is an excellent biofertilizer
Some blue green algae can be used as biofertilizer as they are
Agricultural chemicals include
Organic farming includes
$I.$ use of biofertilisers and biopesticides
$II.$ crop rotation
$III.$ locally developed pest resistant varieties
Choose the correct option