Select the correct option among the given statement:

Options

A. Viruses are obligate parasites
B. In lichens, algal component is called phyeobiont and fungal component is called mycobiont
C. RNA of the viroid was of low molecular weight
D. All the above

Answer

To solve the question of selecting the correct option among the given statements, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze Statement 1: Viruses are obligate parasites.**
- Viruses are indeed classified as obligate parasites because they cannot reproduce independently. They lack the necessary cellular machinery for metabolism and rely entirely on a host cell for replication and protein synthesis. Therefore, this statement is **correct**.

2. **Analyze Statement 2: Lichens are a symbiotic association between Algae and Fungi.**
- Lichens are formed through a mutualistic relationship between algae (which are the photosynthetic component) and fungi (which provide structure and absorb nutrients). The algal component is referred to as the phycobiont, while the fungal component is called the mycobiont. This statement is also **correct**.

3. **Analyze Statement 3: RNA of the Veroid was of low molecular weight.**
- Viroids are indeed small infectious agents composed of RNA. They lack a protein coat and have a low molecular weight compared to viruses. Therefore, this statement is **correct**.

4. **Analyze Statement 4: All of the above.**
- Since all previous statements (1, 2, and 3) have been determined to be correct, this statement is also **correct**.

### Conclusion:
Based on the analysis, the correct option is **4. All of the above**.

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