Test understanding. select the Correct Answer
The cycle of consumption of oxygen by respiration and its release by photosynthesis is called
- respiation
- breathing
- oxygen cycle
- life cycle
Air in motion is called
- oxygen
- carbondioxide
- wind
- nitrogen
which of the following is not a property of air?
- transparent
- occupies space
- exerts pressure
- changes colour
The dark coloured gases caused by burning of anything is called
- carbondioxide
- helium
- fogg
- smoke
It shows the direction in which the air is moving at that place
- weather cock
- wind mill
- air plane
- crops
Air is a _________of gases
- substance
- mixture
- component
- part
Air doesnot consists which of the following?
- gases
- water vapour
- fog
- dust particles
Earth is surrounded by air in form of thin layer called
- environment
- atmosphere
- surrounding
- neighbourhood
In which of the following air is not used?
- rotate windmills
- tyres of vehicles
- dispersal of seeds
- non living things to live
The component of air used by green plants to make food is
- nitrogen
- carbondioxide
- helium
- oxygen