In the case of algae, the statement 'oxygen gas is produced by photosynthesis' is TRUE (Option 4).
Photosynthesis is a chemical process by which algae and plants produce oxygen by using sun radiation (light energy).
During this process (photosynthesis), carbon dioxide is consumed to generate oxygen.
In conclusion, in the case of algae, the statement 'oxygen gas is produced by photosynthesis' is TRUE (Option 4).
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