What is incorrect for phaeophycean 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

To determine what is incorrect for phaeophycean members (brown algae), let's analyze each option step by step.

### Step 1: Analyze the first option
**Statement:** Union of gametes occurs within the oogonium always.
**Analysis:** In brown algae, sexual reproduction can be isogamous (fusion of similar gametes), anisogamous (fusion of dissimilar gametes), or oogamous (fusion of a motile male gamete and a non-motile female gamete). Therefore, the statement that union of gametes occurs within the oogonium always is incorrect.

### Step 2: Analyze the second option
**Statement:** Asexual spores are biflagellate, pear-shaped with lateral flagella.
**Analysis:** This statement is correct. Brown algae produce motile asexual spores (zoospores) that are biflagellate and often have a pear shape with flagella attached laterally.

### Step 3: Analyze the third option
**Statement:** Have chlorophylls A and C.
**Analysis:** This statement is also correct. Brown algae contain chlorophyll a and chlorophyll c, along with other pigments such as carotenoids and xanthophylls.

### Step 4: Analyze the fourth option
**Statement:** Food is stored as a complex carbohydrate.
**Analysis:** This statement is correct as well. Brown algae store food in the form of complex carbohydrates, primarily as glucans.

### Conclusion
Based on the analysis, the incorrect statement regarding phaeophycean members is the first option: "Union of gametes occurs within the oogonium always."

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

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