Burning of fire needs:
oxygen
carbon dioxide
nitrogen
water vapour
Which of the following is not a property of air?
Air occupies space
Air exerts pressure
Air has no mass
Air cannot be seen
What does 'X' represent?
Dew
Rain
Water vapour
Ice
Worms and small organisms grow mostly in:
sub soil
top soil
bed rock
all of these
Which of the following activity requires air?
Mr. Verma reuses water which was used to wash vegetables to water his plants. He is practising ___________ of water.
pollution
conservation
evaporation
desalination
Water turns into steam when it is
cooled
stored
lukewarm
heated
Which of the following layers of soil contains more humus?
Top soil
Sub soil
Bed rock
None of these
Which of the following soils is best for the growth of plants?
loam
gravel
clayey soil
sandy soil
