Question

Describe the exchange of gases which takes place in the leaves of a plant during daytime.

Answer 1

• During the day, both photosynthesis and respiration occur in the leaves.
• Photosynthesis occurs at a much higher rate than respiration because sunlight is available.
• The leaves take in carbon dioxide (CO₂) from the atmosphere through the stomata for photosynthesis.
• Oxygen (O₂) produced during photosynthesis diffuses out of the leaves through the stomata.
• Some of the oxygen produced is used in respiration, but most of it is released into the atmosphere.
• Therefore, during daytime, the net exchange of gases is that plants absorb carbon dioxide and release oxygen.