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Nostoc is a...

Nostoc is a

A

Bacteriophage

B

Beaded bacterium

C

Cyanobacterium

D

Parasite.

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks what Nostoc is. We need to identify its classification and characteristics from the given options. 2. **Analyzing the Options**: - **Option 1: Bacteriophage**: Bacteriophages are viruses that infect bacteria. Nostoc is not a virus. - **Option 2: Beaded Bacterium**: This term is not commonly used in biological classification. Nostoc is not categorized this way. - **Option 3: Cyanobacterium**: Nostoc is indeed a type of cyanobacterium, which is a group of photosynthetic bacteria. - **Option 4: Parasite**: Nostoc is autotrophic and synthesizes its own food, so it does not depend on other organisms for nutrition. 3. **Identifying Key Characteristics of Nostoc**: - Nostoc is a filamentous cyanobacterium. - It has vegetative cells that perform photosynthesis and produce oxygen (oxygenic photosynthesis). - It contains heterocysts, which are specialized cells for nitrogen fixation. 4. **Conclusion**: Based on the analysis, the correct answer is **Option 3: Cyanobacterium**. 5. **Final Answer**: Nostoc is a cyanobacterium. ---
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