Plants use oxygen of the air during ---------------
respiration
excretion
photosynthesis
digestion
The renewable source of energy is ____________
Coal
Wind
Petroleum
Uranium
Flowing water possesses -------------- energy.
Kinetic
Geothermal
Nuclear
Ocean
---------------- was formed from trees or largeplants
natural gas
Methane
LPG is a ----------------- fuel
Gaseous fossil fuels
coal
Bio
None of these
Lowering of soil fertility or degradation of its characteristics is called -----------------------
Soil erosion
Soil pollution
air pollution
none of these
The cover of gases surrounding the earth is called the ------------------
Lithosphere
hydrosphere
atmosphere
buosphere
Agricultural and animal waste material which can be used as a fuel is called ------------
Biomass
Biogas
Converting animal - dung into a more useful fuel called --------------
gobar gas
biogas
both a & b
biomass
