The run-off from catchment areas, Roads, buildings and other fallow lands is called ________?

The break down of pertinacious material is referred to as________?

Nitrogen & sulphur dioxide liberate from motor vehicles & industries. Nitrogen & Sulphur gases dissolve in the water vapour of atmosphere & form nitric & sulphuric acid. This rain water falls on soil as________ & contaminates soil also:

Bombyx morri is the name of________?

Plants adopted to arid regions are________?

The average weight of commercial bird is about ________?