Srujal

What is the composition of air?

• Carbon Dioxide and Water Vapor

• Oxygen and Carbon Dioxide

• Nitrogen and Carbon Dioxide

• Nitrogen and Oxygen

Which gas in the atmosphere is essential for respiration?

• Water Vapor

• Nitrogen

• Carbon Dioxide

• Oxygen

How will you prove that air supports burning?

• By covering a candle with a glass tumbler

• By heating water in a container

• By observing bubbles in water

• By observing dust particles in sunlight

How will you show that air is dissolved in water?

• By covering a candle with a glass tumbler

• By heating water in a container

• By observing bubbles in water

• By observing dust particles in sunlight

Why does a lump of cotton wool shrink in water?

• Due to the presence of water vapor in the cotton wool

• Due to the presence of nitrogen in the cotton wool

• Due to the presence of carbon dioxide in the cotton wool

• Due to the presence of air in the cotton wool

The layer of air around the earth is known as ___________.

• Ozone

• Atmosphere

• Stratosphere

• Troposphere

The component of air used by green plants to make their food, is ___________.

• Nitrogen

• Oxygen

• Water Vapor

• Carbon Dioxide

List five activities that are possible due to the presence of air.

• Running, Swimming, Cycling, Jumping, Climbing

• Sailing, Gliding, Parachuting, Flying, Dispersal of seeds

• Cooking, Cleaning, Reading, Writing, Sleeping

• Skiing, Skating, Snowboarding, Ice Hockey, Bobsledding

How do plants and animals help each other in the exchange of gases in the atmosphere?

• Plants and animals produce oxygen and carbon dioxide

• Plants produce carbon dioxide and animals produce oxygen

• Plants and animals do not help each other in the exchange of gases

• Plants produce oxygen and animals produce carbon dioxide