D.D.T,malathion,chloropyriphos,humus - odd one out
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HUMMUS BECAUSE IT'S BIO DEGREDABLE
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humus. All the remaining options - D.D.T,malathion,chlorpyrifos - are one or the other form of pesticide or insecticide.
Humus is a biodegradable substance found in soil and is important to determine the nature of soil. It is amorphous and determines the density of soil.
The nutrient and moisture retention of a soil is dependent on it significantly. It is a dark organic matter which forms in soil after animal matter and dead plant start decaying.
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