Select true statement:

Options

A. Viruses are obligate parasties
B. In Lichens, algal component is called phycobiont
C. In Lichens, Fungal component is called mycobiont
D. All the above

Answer

To determine which statement is true, let's analyze each of the provided statements step by step.

### Step 1: Analyze the First Statement
**Statement:** "Viruses are obligate parasites."
- **Explanation:** This statement is true. Viruses cannot reproduce or carry out metabolic processes on their own; they require a host cell to replicate and perform necessary functions. Therefore, they are classified as obligate parasites.

### Step 2: Analyze the Second Statement
**Statement:** "In lichen, the algal component is called as the mycobiont."
- **Explanation:** This statement is false. In lichen, the algal component is actually called the **phycobiont**, while the fungal component is referred to as the **mycobiont**. Therefore, this statement is incorrect.

### Step 3: Analyze the Third Statement
**Statement:** "In lichen, the fungal component is called as the mycobiont."
- **Explanation:** This statement is true. The fungal component of lichen is indeed referred to as the mycobiont. This is a correct statement.

### Step 4: Analyze the Fourth Statement
**Statement:** "All of the above."
- **Explanation:** Since the second statement is false, the option "all of the above" cannot be true.

### Conclusion
The true statements are:
1. Viruses are obligate parasites (true).
2. The algal component in lichen is called phycobiont (true).
3. The fungal component in lichen is called mycobiont (true).

Since the question asks to select the true statement, the correct answer is:
- **Option 1:** "Viruses are obligate parasites."
- **Option 3:** "In lichen, the fungal component is called as the mycobiont."

However, since the question asks for a single true statement and the fourth option "all of the above" is incorrect, the best answer is **Option 1**.