Air Around Us

The _____ is surrounded by an envelope of air

• biosphere
• stratosphere
• lithosphere
• atmosphere

Air in motion is called

• Hydrogen

• Nitrogen

• Wind

• Gas

__________ process by which both plants and animals get energy by Breaking down the food.

• Fermentation
• Digestion
• respiration

• Photosynthesis

The gas which turns limewater milky

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

The ________ of air are nitrogen, oxygen, carbon dioxide ect...

• components
• particles
• substances
• elements

Lavoisier in 1789 proved that the active part of air is __________ .

• hydrogen
• carbon dioxide
• nitrogen
• oxygen

Plants contribute a major portion of water vapour to the atmosphere through the process of _________.

• Transpiration
• Precipitation
• Evaporation
• Photosynthesis

Which component of air is used by green plants to make food ?

• Oxygen
• Nitrogen
• Carbon dioxide
• Argon

Garima observed that when she left her tightly capped bottle, full of water in the open sunlight

, tiny bubbles formed all around inside the bottle. Help garima to know why it so happen?

• The bubbles form due to the water being contaminated with soap residue.
• The tiny bubbles form due to the process of photosynthesis carried out by microorganisms in the water.
• The bubbles are a result of the water being exposed to cosmic radiation.
• The bubbles form because the water is too cold.

Earthworm 🪱 come out during rain because they need to breathe in _______ .

• hydrogen
• oxygen
• nitrogen
• carbon dioxide