Question : The biological process in which both aerobes and anaerobes degrade organic matter is:

Option 1: Manuring

Option 2: Composting

Option 3: Digesting

Option 4: Nitrifying

Question : A unit price elastic demand curve will touch 

Option 1: Both price and quantity axis .

Option 2: Neither price axis , nor quantity axis.

Option 3: Only price axis .

Option 4: Only quantity axis .

Question : Eutrophication is caused by an excess of:

Option 1: Nitrogen and phosphorus

Option 2: Oxygen and carbon dioxide

Option 3: Mercury and lead

Option 4: Sulfur and chlorine

Question : The demand for the commodity is direct but the demand for a factor of production is called a: 

Option 1: crossed demand 

Option 2: joint demand

Option 3: derived demand 

Option 4: independent demand 

Question : Blood group AB has

Option 1: no antigen

Option 2: no antibody

Option 3: neither antigen nor antibody

Option 4: both antigen and antibody