Science of algae is

Options

A. Phycology
B. Mycology
C. Oceanology
D. Microbiology.

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the scientific study of algae. This is a straightforward inquiry into the terminology used in biology to describe the study of a specific group of organisms.

2. **Identifying the Options**: The options provided are:
- A) Phycology
- B) Mycology
- C) Oceanology
- D) Microbiology

3. **Analyzing Each Option**:
- **Phycology**: This is the scientific study of algae. It encompasses both the study of eukaryotic and prokaryotic forms of algae, including cyanobacteria (blue-green algae).
- **Mycology**: This branch of biology focuses on the study of fungi, not algae.
- **Oceanology**: This field studies oceans and marine environments, but it does not specifically focus on algae.
- **Microbiology**: This is the study of microorganisms, which includes bacteria, viruses, and fungi, but does not specifically target algae.

4. **Selecting the Correct Answer**: Based on the analysis, the correct answer is **Phycology**, as it directly pertains to the study of algae.

5. **Conclusion**: Therefore, the science of algae is known as **Phycology**.