Mycorrhiza is helpful in
Synthesis of food
Getting nutrients from soil
Providing resistance against different regulators
Increase the fertility of soil
The common nitrogenfixer in paddy fields is
Which of the following plants is used as biofertiliser
If wheat field is inoculated with Rhizobium
Organic farming includes
$I.$ use of biofertilisers and biopesticides
$II.$ crop rotation
$III.$ locally developed pest resistant varieties
Choose the correct option
Crop rotation is carried out for