Multiple choice

Which of the following is a rhodophyte used as food for humans and various species of shellfish?

  1. Spirogyra

  2. Cladophora

  3. Hydrodictyon

  4. Spirulina

  5. Gracilaria
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Gracilaria is a genus of rhodophytes (red algae), most well-known for its economic importance as a source of agar.

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