air and water

how to prevent air pollution

• to plant trees

• to use bicycles or public transport instead of using private vehicles.

• to share the seat in car or bike to other person or the friend who is coming or going to the same destination or place where we are going to go to

• all of the mentioned choices

The components of air which is taken by Plants to prepare the food?

• O₂

• N₂

• CO₂

• None of these

Which of the following is NOT present in air?

• Oxygen

• Nitrogen

• Helium

• Iron

Which gas is produced by plants during photosynthesis?

• Nitrogen

• Carbon Dioxide

• Hydrogen

• Oxygen

Where is Oxygen used?

• Living being

• Combustion of fuel

• Rusting of iron

• All the above

The presence of water vapor in air is important for

• Water Cycle

• Ozone layer

• Combustion

• None of the above

Statement A: Nitrogen is used in protein synthesis

Statement B: Proteins are required by living organisms to grown and repair their body parts

(a)Only Statement A is correct

(b)Only Statement B is correct

(c) Both the statements are correct

(d) Both the statements are incorrect

• A

• B

• C

• D

Which of the following gas helps in burning?

• Nitrogen

• Oxygen

• Carbon dioxide

• Carbon monoxide

Wind is

• air around us

• rising hot air

• air in motion

• none of these

Warm air is __________as compared to cold air.

• Heavier

• Lighter

• no change

• none of the above