Understanding Earth's Atmosphere and Respiration

What are the main gases that make up the Earth's atmosphere?

• Carbon Monoxide, Ozone, Nitrogen, Oxygen

• Oxygen, Nitrogen, Carbon Dioxide, Water Vapor

• Helium, Argon, Methane, Neon

• Hydrogen, Helium, Oxygen, Nitrogen

What happens to the flame in the experiment when a glass is placed over a lit candle?

• The flame changes color

• The flame burns brighter

• The flame splits into two

• The flame goes out

What is the primary component of air that is inactive?

• Carbon Dioxide

• Water Vapor

• Oxygen

• Nitrogen

How does the composition of inhaled air differ from exhaled air in terms of oxygen?

• Exhaled air has more oxygen than inhaled air

• Inhaled air has no oxygen

• Inhaled air has more oxygen than exhaled air

• Both have the same amount of oxygen

What is the main purpose of respiration in living organisms?

• To release energy from food

• To produce water

• To produce carbon dioxide

• To absorb sunlight

Why is it advised not to sleep under trees at night?

• Trees release oxygen at night

• Trees produce harmful gases at night

• Trees release carbon dioxide at night

• Trees absorb all the oxygen at night

What are the two main processes that occur in plants?

• Photosynthesis and Fermentation

• Combustion and Respiration

• Respiration and Combustion

• Photosynthesis and Respiration

During photosynthesis, what do plants release as a byproduct?

• Carbon Dioxide

• Nitrogen

• Oxygen

• Water Vapor

What is the role of sunlight in photosynthesis?

• To help in respiration

• To cool down the plant

• To provide energy for making food

• To provide heat

What is observed in the experiment with the hydrilla plant under sunlight?

• The water level rises

• The plant wilts

• Oxygen bubbles form

• The plant changes color