A parasite which becomes saprophytic in the absence of host is called

Options

A. Obligate parasite
B. Facultative parasite
C. Obligate saprophyte
D. Facultative saprophyte.

Answer

To answer the question, "A parasite which becomes saprophytic in the absence of host is called," we will analyze the definitions of the terms provided in the options and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding Parasites**:
- A parasite is an organism that derives its nutrients from a living host. It relies on the host for survival and sustenance.

2. **Identifying the Options**:
- The options provided are:
1. Obligate parasite
2. Facultative parasite
3. Obligate saprophyte
4. Facultative saprophyte

3. **Analyzing Each Option**:
- **Obligate Parasite**: This type of parasite cannot complete its life cycle without a host. If there is no host, it cannot survive or reproduce.
- **Facultative Parasite**: This type of parasite does not completely depend on the host for its life cycle. It can survive without a host and may take on a saprophytic lifestyle when a host is absent.
- **Obligate Saprophyte**: This organism relies entirely on dead organic matter for nutrients and does not have a parasitic phase.
- **Facultative Saprophyte**: This organism can act as a parasite when a host is present but can also switch to a saprophytic lifestyle in the absence of a host.

4. **Determining the Correct Answer**:
- Since the question specifically asks for a parasite that can become saprophytic in the absence of a host, the correct answer is **Facultative Saprophyte**. This organism can switch its mode of nutrition based on the availability of a host.

5. **Final Answer**:
- Therefore, the answer to the question is **Facultative Saprophyte**.