Death of host shall be disastrous to

Options

A. Predator
B. Symbiont
C. Commensal
D. Parasite

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which type of organism would be most adversely affected by the death of its host.

2. **Identifying the Options**: The options given are predator, symbiont, commensal, and parasite.

3. **Defining Each Term**:
- **Predator**: An organism that hunts and feeds on other organisms. It is not dependent on a single host for survival.
- **Symbiont**: An organism that lives in a symbiotic relationship with another organism. This can be mutualistic (both benefit) or commensal (one benefits, the other is unaffected).
- **Commensal**: An organism that benefits from another organism without harming it. It does not live in or on the host.
- **Parasite**: An organism that lives in or on another organism (the host) and derives nutrients at the host's expense. It is highly dependent on the host for survival.

4. **Analyzing the Dependency**:
- A **parasite** is completely dependent on its host for nutrients and survival. If the host dies, the parasite loses its source of sustenance and will likely perish as well.
- In contrast, a predator can find other prey, a symbiont may not rely solely on one organism, and a commensal does not live in or on the host.

5. **Conclusion**: The death of the host would be disastrous for the **parasite**, as it relies entirely on the host for its survival.

**Final Answer**: The correct option is **parasite**.

---