BALANCE OF OXYGEN AND CARBON DIOXIDE IN THE AIR
• The balance of oxygen and carbon dioxide in the atmosphere is maintained through respiration in plants and animals and by photosynthesis in plants.
• Plants produce oxygen during photosynthesis and utilize oxygen during respiration.
• They produce much more oxygen during photosynthesis than they consume.
• This is how the oxygen consumed by plants and to a large extent by animals is replenished in the air through photosynthesis.