Oxygen Cycle and Photosynthesis Concepts

The video tutorial explains the oxygen cycle, highlighting its importance in sustaining life. It covers the process of respiration, the role of oxygen in the human body, and how the oxygen cycle balances oxygen usage and production in nature. The tutorial also discusses the processes that produce or consume oxygen, such as photosynthesis, respiration, and combustion. It emphasizes the importance of plants in the oxygen cycle and encourages the conservation of trees to ensure a sustainable future.

Why is breathing essential for living organisms?

• To produce carbon dioxide

• To obtain oxygen for cellular processes

• To absorb sunlight

• To release nitrogen

What percentage of the Earth's atmosphere is made up of oxygen?

• 30%

• 21%

• 65%

• 50%

What is the oxygen cycle primarily about?

• The destruction of oxygen

• The creation of oxygen

• The recycling of oxygen

• The storage of oxygen

Which of the following is NOT a process that uses up oxygen?

• Oxidation

• Combustion

• Photosynthesis

• Respiration

How do plants contribute to the oxygen cycle?

• By consuming carbon dioxide

• By producing oxygen through photosynthesis

• By releasing carbon dioxide

• By absorbing oxygen

What is the primary role of oxygen in the human body?

• To store fat

• To build muscle

• To break down sugars for energy

• To produce vitamins

Which process releases oxygen into the atmosphere?

• Respiration

• Combustion

• Photosynthesis

• Oxidation

What happens to carbon dioxide produced by humans and animals?

• It is used by plants in photosynthesis

• It is absorbed by the ocean

• It is stored in the soil

• It is converted into oxygen

Why is it important to plant more trees?

• To increase carbon dioxide levels

• To reduce oxygen levels

• To sustain the oxygen cycle

• To prevent photosynthesis

What is a related cycle that is mentioned in the video?

• Carbon cycle

• Water cycle

• Sulfur cycle

• Nitrogen cycle