Smallest angiospermic parasite Arceuthobium is:

Options

A. Total root parasite
B. Total stem parasite
C. Partial root parasite
D. Partial stem parasite

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks about the smallest angiospermic parasite, Arceuthobium, and its classification as a type of parasite.

2. **Identifying Arceuthobium:**
Arceuthobium is known to be a genus of parasitic plants, specifically known as dwarf mistletoes. They primarily attach to the stems of their host plants, which are usually conifers like pines.

3. **Classifying the Type of Parasite:**
Parasites can be classified based on their attachment and dependency on the host:
- Total root parasite: A parasite that completely relies on the roots of the host for nutrients.
- Total stem parasite: A parasite that completely relies on the stem of the host for nutrients.
- Partial root parasite: A parasite that partially relies on the host's roots but can also perform photosynthesis.
- Partial stem parasite: A parasite that partially relies on the host's stem but can also perform photosynthesis.

4. **Determining the Correct Classification for Arceuthobium:**
Since Arceuthobium attaches to the stems of its host (pines) and relies on them for nutrition, it is classified as a total stem parasite.

5. **Conclusion:**
Therefore, the correct answer to the question is that Arceuthobium is a total stem parasite.

**Final Answer:**
The smallest angiospermic parasite, Arceuthobium, is a total stem parasite.

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