Describe the exchange of gases which takes place in the leaves of a plant:
- During daytime.
- At night.
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- During daytime when photosynthesis occurs, oxygen is produced. The leaves use some of this oxygen for respiration and the rest of oxygen diffuses out into the air. Carbon-dioxide produced by respiration is all used up in photosynthesis by leaves during the daytime. Even more carbon-dioxide is taken in from air. Thus, the net gas exchange in leaves during daytime is: Oxygen diffuses out Carbon-dioxide diffuses in.
- At night time, when no photosynthesis occurs and hence no oxygen is produced, oxygen from air diffuses in leaves to carry out respiration. Carbon dioxide produced by respiration diffuses out into air. So, the net gas exchange in leaves at night is: Oxygen diffuses in Carbon-dioxide diffuses out.
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