Which of the following are the characteristics of phaeophyceae ?
(i) possess chlorophyll a,c carotenoids and xanthophylls.
(ii) Food stored is in the from of laminarin and mannitol.
(iii) Asexual reproduction by biflagellate zoospores that have two equal apically attached flagella.
(iv) Cell wall has cellulose and algin.
(v) sexual reproduction is oogamous only.
(vi) Gamestes have two laterally attached flagella.

Options

A. i,iii,iv,v
B. ii, iii, v,vi
C. i, ii,iv,vi
D. i,iii , v

Answer

To solve the question regarding the characteristics of Phaeophyceae (Brown Algae), we will analyze each statement one by one:

1. **Statement (i)**: "Possess chlorophyll a, c, carotenoids, and xanthophylls."
- **Analysis**: This statement is correct. Phaeophyceae contains chlorophyll a and c, along with carotenoids and xanthophylls. The pigment fucoxanthin is primarily responsible for the brown color in these algae.

2. **Statement (ii)**: "Food stored is in the form of laminarin and mannitol."
- **Analysis**: This statement is also correct. Brown algae store their food primarily in the form of laminarin and mannitol.

3. **Statement (iii)**: "Asexual reproduction by biflagellate zoospores that have two equal apically attached flagella."
- **Analysis**: This statement is incorrect. In Phaeophyceae, the zoospores are biflagellate but they have two unequal flagella that are laterally attached, not apically attached.

4. **Statement (iv)**: "Cell wall has cellulose and algin."
- **Analysis**: This statement is correct. The cell wall of brown algae is composed of cellulose and algin, which is a gelatinous substance.

5. **Statement (v)**: "Sexual reproduction is oogamous only."
- **Analysis**: This statement is incorrect. While sexual reproduction in Phaeophyceae can be oogamous (involving large non-motile eggs and small motile sperm), it can also be isogamous (involving gametes of similar size) or anisogamous (involving gametes of different sizes).

6. **Statement (vi)**: "Gametes have two laterally attached flagella."
- **Analysis**: This statement is correct. The gametes of Phaeophyceae typically have two laterally attached flagella.

### Conclusion:
The correct characteristics of Phaeophyceae are:
- Statement (i): Correct
- Statement (ii): Correct
- Statement (iii): Incorrect
- Statement (iv): Correct
- Statement (v): Incorrect
- Statement (vi): Correct

Thus, the correct statements are (i), (ii), (iv), and (vi).

### Final Answer:
The characteristics of Phaeophyceae are (i), (ii), (iv), and (vi).

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