Viruses have no useful characteristic for humans.

Cow and goats digest grass because of the presence of cellulose digesting bacteria in their gut.

Penicillin a soil fungus is used to produce the antibiotic penicillin.

Cotton is grown for commercial purpose and is called cash crop.

Wheat is a rabi crop. It is sown after monsoons

Some brown algal are important sources of iodine.

Fungi and bacteria feed on dead and decaying matter and are called decoposers.

Rabi crops are sown after the monsoon, around October.

Alluvial soil is most fertile soil as it is loamy is texture and has plenty of humus.

Loamy soil is best suited for cultivation as it contains the right mixture of sand, clay and qitt.

Winnowing is the process of separating the gain from the chaff that gets mixed with it during threshing.

Harvesting in small fields is done manually using sickles and in large fields, it is done with combines.

The seeds of some crops, like onion and rice are not sown directly in the field. They are sown in sebeds first and then transplanted to field.

Anabena and Nostoc are very useful for agricultural as they enrich the soil with nitrogen.