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Agar is commercially obtained from:

1. red algae
2. green algae
3. brown algae
4. blue-green algae

Correct answer: red algae

Solution

Agar is extracted from certain species of red algae (Rhodophyceae), especially seaweeds like Gelidium and Gracilaria. It is widely used as a gelling agent because of its strong gel-forming properties.

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