These are considered as valuable sinks for $C{O}_{2}CO\_2$………………

D.D.T was not soluble in water but in …………

Expanded form of D.D.T is …………

The range of pH values of good soil lies from ……………

The process of combustion in absence of oxygen is …………

Calcium deficiency in soils is due to

Microbial activity and nutrient absorption in soils is due to

Which of the following does NOT cause soil pollution?

BOD means

The microorganisms that help in the formation of soil ……………