Total root parasite is

Options

A. Rafflesia
B. Cassytha
C. Viscum
D. Loranthus.

Answer

To determine the total root parasite from the given options, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Total Root Parasite**:
- A total root parasite is an organism that completely relies on the roots of a host plant for all its nutritional needs, including water, minerals, and food.

2. **Evaluate the Options**:
- **Option 1: Rafflesia**: This is known to be a total root parasite. It does not perform photosynthesis and depends entirely on its host for nutrients.
- **Option 2: Kasaitha**: This is a stem parasite, which means it attaches to the stem of the host plant and does not depend on the roots for nutrition.
- **Option 3: Viscum**: This is also a partial stem parasite. It extracts water and minerals from the host but does not rely on the roots.
- **Option 4: Doranthus**: This is not commonly recognized as a total root parasite.

3. **Identify the Correct Answer**:
- Based on the definitions and evaluations, the only organism that qualifies as a total root parasite is **Rafflesia**.

4. **Conclusion**:
- Therefore, the answer to the question "Total root parasite is" is **Option 1: Rafflesia**.