Autotrophic thallophytes are called as :-

Options

A. Fungi
B. Lichens
C. Algae
D. Microbes

Answer

**Step-by-Step Solution:**

1. **Understanding Autotrophic Organisms**:
- Autotrophic organisms are those that can produce their own food through photosynthesis, using sunlight as their energy source.

2. **Defining Thallophytes**:
- Thallophytes are a group of plants that do not have true roots, stems, or leaves. They have a simple body structure known as a thallus.

3. **Identifying Autotrophic Thallophytes**:
- Among thallophytes, algae are the primary autotrophic organisms. They can perform photosynthesis and have a thalloid body structure.

4. **Analyzing Other Options**:
- Fungi are not autotrophic; they are saprophytic, meaning they feed on dead organic matter.
- Lichens are a symbiotic association between algae and fungi, and thus do not qualify as thallophytes on their own.
- Microbes are a broad category and do not specifically refer to autotrophic thallophytes.

5. **Conclusion**:
- Based on the definitions and characteristics discussed, the correct answer is that autotrophic thallophytes are called **Algae**.

**Final Answer**: Autotrophic thallophytes are called **Algae**.

---