Fill in the following blanks with suitable words :
(a) LPG is a ________ fuel but biogas is not a____ fuel.
(b) Glaciers are a source of ________
(c) One of the main aims of management of forests and
wildlife is to conserve the ________ which we have inherited.
(d) Khadin is a traditional ________ harvesting system in
Rajasthan.
(e)When fuel burns in an insufficient supply of air, then
some poisonous gas called ________ is
also produced.