What is common to the following plants: Nepenthes Psilotum, Rauwolfia and Aconitum ?

Options

A. All are ornamental plants
B. All are phylogenic link species
C. All are prone to over exploitation
D. All are exclusively present in the East- ern Himalayas

Explanation

To determine what is common to the plants Nepenthes, Psilotum, Rauwolfia, and Aconitum, we will analyze each plant and identify their characteristics.

### Step-by-Step Solution:

1. **Identify Each Plant**:
- **Nepenthes**: This is a carnivorous plant commonly known as the pitcher plant. It has modified leaves that form a pitcher-like structure to trap and digest insects.
- **Psilotum**: This is a type of fern, belonging to the group known as pteridophytes. It does not have true leaves or roots and reproduces via spores.
- **Rauwolfia**: This is an angiosperm, known for producing the alkaloid reserpine, which is used in medicine, particularly for treating high blood pressure.
- **Aconitum**: Also an angiosperm, Aconitum is known for its toxic properties and is used in traditional medicine, particularly in Ayurveda.

2. **Analyze Common Features**:
- **Ornamental Use**: Nepenthes is not typically used as an ornamental plant due to its carnivorous nature. Similarly, Psilotum is not commonly used for decoration. Rauwolfia and Aconitum may have some ornamental value, but they are primarily valued for their medicinal properties.
- **Phylogenetic Link**: While all these plants belong to different groups (Nepenthes as a carnivorous plant, Psilotum as a fern, and Rauwolfia and Aconitum as angiosperms), they do not share a close phylogenetic relationship.
- **Overexploitation**: All four plants are prone to overexploitation. Nepenthes is collected for its unique structure, Psilotum is often harvested for its rarity, Rauwolfia is harvested for its medicinal alkaloids, and Aconitum is harvested for its medicinal uses despite its toxicity.

3. **Conclusion**: The commonality among Nepenthes, Psilotum, Rauwolfia, and Aconitum is that they are all prone to overexploitation by humans. This overexploitation has led to concerns about their conservation status.

### Final Answer:
All of the plants Nepenthes, Psilotum, Rauwolfia, and Aconitum are prone to overexploitation.