Parasites capable of living without a host are called

Options

A. Obligate
B. Facultative
C. Permanent
D. None of these

Answer

To answer the question "Parasites capable of living without a host are called," we can break down the options provided and analyze them step by step.

### Step-by-Step Solution:

1. **Understanding Parasites**: First, we need to understand what parasites are. Parasites are organisms that live on or in a host organism and benefit by deriving nutrients at the host's expense.

2. **Identifying Types of Parasites**: There are different types of parasites based on their dependence on the host:
- **Obligate Parasites**: These parasites cannot survive without a host. They are entirely dependent on their host for survival and reproduction.
- **Facultative Parasites**: These parasites can live both with and without a host. They are not strictly dependent on a host for survival and can thrive in other environments.
- **Permanent Parasites**: These parasites live in or on the host for their entire life cycle. They are not capable of existing independently outside of the host.
- **None of the Above**: This option implies that none of the previous classifications fit the description.

3. **Analyzing the Options**:
- **Option A: Obligate** - This is incorrect because obligate parasites cannot live without a host.
- **Option B: Facultative** - This is correct because facultative parasites can survive without a host.
- **Option C: Permanent** - This is incorrect as permanent parasites rely on the host for their entire life.
- **Option D: None of this** - This is also incorrect since we have identified a valid option.

4. **Conclusion**: Based on the analysis, the correct answer is **Option B: Facultative**. These are the parasites that are capable of living without a host.

### Final Answer:
Parasites capable of living without a host are called **facultative parasites**.

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