What is incorrect for phaeophyean members ?

Options

A. Union of gametes occurs within the oogonium always
B. Asexual spores are biflagellate, pear-shaped with lateral flagella
C. Have chlorophylls like a & c
D. Food is stored as complex carbohydrates

Answer

**Step-by-Step Solution:**

1. **Understanding Phaeophyceae**: Phaeophyceae, commonly known as brown algae, is a class of algae characterized by their brown color due to the presence of the pigment fucoxanthin. They are primarily found in marine environments.

2. **Identifying the Options**: The question asks us to identify the incorrect statement regarding Phaeophyceae members. The options provided include statements about sexual reproduction, the nature of gametes, the type of chlorophyll present, and how food is stored.

3. **Analyzing Each Statement**:
- **Statement 1**: "Union of gametes occurs within the oogonium always."
- This statement is incorrect because while gametes can fuse in the oogonium, they can also fuse in water or other environments. Therefore, it is not always within the oogonium.
- **Statement 2**: "These sexual spores are biflagellate, pear-shaped and lateral flagella."
- This statement is correct as brown algae typically produce biflagellate spores.
- **Statement 3**: "Chlorophyll A and C are present."
- This statement is also correct; brown algae contain chlorophyll A and C.
- **Statement 4**: "Food is stored as complex carbohydrates."
- This statement is correct as well; brown algae store food in the form of mannitol and laminarin, which are complex carbohydrates.

4. **Conclusion**: The incorrect statement regarding Phaeophyceae members is the first one: "Union of gametes occurs within the oogonium always."

**Final Answer**: The incorrect statement for Phaeophyceae members is: "Union of gametes occurs within the oogonium always."

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