Stored food in Phaeophyceae is:

Options

A. Laminarin or manitol
B. Starch
C. Cellulose
D. Algin and carragen are products of algae

Answer

**Step-by-Step Solution:**

1. **Identify the Group**: The question is about the stored food in Phaeophyceae, which is a class of algae commonly known as brown algae.

2. **Characteristics of Phaeophyceae**: Brown algae are primarily marine and can be found in tidal and sub-tidal regions. They are known for their photosynthetic pigments, which include chlorophyll A and chlorophyll C.

3. **Stored Food Products**: In Phaeophyceae, the stored food is primarily in the form of two substances: mannitol and laminarin. Mannitol is a type of sugar alcohol, while laminarin is a polysaccharide.

4. **Comparison with Other Algae**: It is useful to compare the stored food in Phaeophyceae with that in other classes of algae:
- In Chlorophyceae (green algae), the stored food is starch.
- In Rhodophyceae (red algae), the stored food is Floridian starch.

5. **Conclusion**: Based on the information about Phaeophyceae, the correct answer to the question regarding the stored food in this class of algae is that it is primarily laminarin and mannitol.

**Final Answer**: The stored food in Phaeophyceae is laminarin and mannitol.

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