Which of the following is considered to be blue-green algae?

Options

A. eubacteria
B. cyanobacteria
C. archaebacteria
D. progenote

Answer

To determine which of the given options is considered to be blue-green algae, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Term "Blue-Green Algae":**
- Blue-green algae are commonly known for their photosynthetic abilities and their characteristic color, which is a blue-green hue.

2. **Analyzing the Options:**
- **Option A: Eubacteria** - This is a broad category of bacteria but does not specifically refer to blue-green algae.
- **Option B: Cyanobacteria** - This group of bacteria is known for its blue-green color and photosynthetic capabilities, making it a prime candidate for blue-green algae.
- **Option C: Archaebacteria** - These are a different group of bacteria that are not related to blue-green algae.
- **Option D: Progenod** - This term does not correspond to any recognized group of organisms related to blue-green algae.

3. **Identifying the Correct Answer:**
- Based on the analysis, **Cyanobacteria** is the correct term that refers to blue-green algae. They are prokaryotic organisms that perform photosynthesis and are often found in aquatic environments.

4. **Conclusion:**
- Therefore, the correct answer to the question is **Option B: Cyanobacteria**.