(a) Public transport in Delhi uses CNG since 2002. List the advantages of this fuel policy.
(b) Construct labelled grazing and detritus food chains with minimum 3 trophic levels each. (5 marks)
(a) Advantages of CNG :
(i) CNG burns most efficiently, more than petrol or diesel in automobiles and very little of it is
(ii) CNG is cheaper than petrol or diesel and it can not be stolen by thieves and adulterated like
petrol or diesel.
(b) Grazing food chain :