Question

Ulothrix can be described as a

• A. filamentous alga lacking flagellated reproductive stages
• B. membranous alga producing zoospores
• C. filamentous alga with flagellated reproductive stages
• D. non-motile colonial alga lacking zoospores.

Answer 1

The Correct Option is C

Ulothrix is a type of green alga commonly found in freshwater and marine environments. To determine the correct answer, we need to examine its characteristics:

1. **Filamentous Structure**: Ulothrix is known for its filamentous, or thread-like, structure. It consists of a series of cells arranged end-to-end, forming long, unbranched filaments. This feature is typical of many types of algae, providing a large surface area for photosynthesis.

2. **Reproductive Stages**: Ulothrix reproduces both asexually and sexually. During its asexual reproduction, it produces flagellated zoospores. These small, motile spores are equipped with flagella, allowing them to move freely in water. This makes them an important component of its reproductive cycle.

3. **Sexual Reproduction**: In sexual reproduction, Ulothrix can produce gametes, which are also flagellated, enabling them to swim towards each other for fertilization.

Conclusion:

Based on the characteristics mentioned above, Ulothrix is accurately described as a "filamentous alga with flagellated reproductive stages."

Let's compare this with the given options:

• **Option 1: Filamentous alga lacking flagellated reproductive stages** - This option is incorrect as Ulothrix has flagellated reproductive stages.
• **Option 2: Membranous alga producing zoospores** - Ulothrix is filamentous, not membranous, though it does produce zoospores.
• **Option 3: Filamentous alga with flagellated reproductive stages** - This is the correct option as previously explained.
• **Option 4: Non-motile colonial alga lacking zoospores** - Ulothrix is neither colonial nor non-motile, and it does produce zoospores.

Therefore, the correct answer is: filamentous alga with flagellated reproductive stages.