Read the following statements :- (A) The vegetative cells have a cellulosic wall usually covered by coating of algin
(B) Vegetative reproduction takes place by fragmentation
(C) Sexual reproduction may be isogamous, anisogamous or oogamous
(D) The gametes are pyriform (Pear shaped) and bear two laterally attached unequal flagella Which algal group represents these characteristics ?

Options

A. Chlorophyceae
B. Phaeophyceae
C. Rhodophyceae
D. Xanthophyceae

Answer

To determine which algal group represents the given characteristics, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Analyze Statement (A)**:
- The statement mentions that "The vegetative cells have a cellulosic wall usually covered by a coating of algin."
- Algin is a polysaccharide commonly found in the cell walls of brown algae.
- Therefore, this characteristic is indicative of the group **Phaeophyceae** (brown algae).

2. **Analyze Statement (B)**:
- The statement states, "Vegetative reproduction takes place by fragmentation."
- In Phaeophyceae, vegetative reproduction often occurs through fragmentation, where parts of the plant break off and grow into new individuals.
- This confirms that **Phaeophyceae** is consistent with this characteristic.

3. **Analyze Statement (C)**:
- The statement indicates that "Sexual reproduction may be isogamous, anisogamous, or oogamous."
- Phaeophyceae exhibit various types of sexual reproduction, including isogamous (same size gametes), anisogamous (different size gametes), and oogamous (large non-motile egg and small motile sperm).
- This characteristic is also true for **Phaeophyceae**.

4. **Analyze Statement (D)**:
- The statement describes that "The gametes are pyriform (pear-shaped) and bear two laterally attached unequal flagella."
- In Phaeophyceae, the gametes are indeed pyriform and possess two unequal flagella, which are characteristic of this group.
- This confirms that **Phaeophyceae** matches this characteristic as well.

### Conclusion:
Based on the analysis of all four statements, the algal group that represents these characteristics is **Phaeophyceae**.

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