A partial parasite is

Options

A. Cuscuta
B. Cassytha
C. Arceuthobium
D. Viscum

Answer

### Step-by-Step Solution:

1. **Understanding the Definition of a Partial Parasite**: A partial parasite, also known as a hemiparasite, is a type of plant that can photosynthesize and produce its own food but also derives some nutrients from a host plant.

2. **Identifying the Options**: The options provided are:
- A) Cascuta
- B) Arceuthobium
- C) Viscum
- D) Viscum album

3. **Analyzing Each Option**:
- **Cascuta**: This is a total parasite (holoparasite) that cannot photosynthesize and relies entirely on the host for nutrients.
- **Arceuthobium**: This is also a total parasite that depends completely on its host.
- **Viscum**: This refers to the genus that includes mistletoe, which can photosynthesize and thus is a partial parasite.
- **Viscum album**: This is the scientific name for mistletoe, confirming that it is a partial parasite.

4. **Conclusion**: Since Viscum (specifically Viscum album) is capable of photosynthesis while also depending on a host for some nutrients, it fits the definition of a partial parasite.

5. **Final Answer**: The correct answer is **C) Viscum album**.