What is common to the following plants: Nepenthes Psilotum, Rauwolfia and Aconitum ?
(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 Eastern Himalayas.

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 Eastern Himalayas.

Explanation

To solve the question, we need to analyze the characteristics of the plants mentioned: Nepenthes, Psilotum, Rauwolfia, and Aconitum.

### Step-by-Step Solution:

1. **Identify the Plants:**
- **Nepenthes:** This is a genus of carnivorous plants known as pitcher plants. They are known for their unique structure that traps and digests insects.
- **Psilotum:** This is a genus of primitive vascular plants, often referred to as whisk ferns. They have medicinal properties and are used in traditional medicine.
- **Rauwolfia:** This is a genus of flowering plants known for their medicinal properties, particularly in the treatment of hypertension. The drug reserpine is derived from Rauwolfia.
- **Aconitum:** Commonly known as monkshood or wolfsbane, this plant is also known for its medicinal properties but can be toxic.

2. **Evaluate the Options:**
- **(a) All are ornamental plants:** This is incorrect as not all of them are primarily grown for ornamental purposes.
- **(b) All are phylogenic link species:** While some may have evolutionary significance, this option does not apply to all the mentioned plants.
- **(c) All are prone to overexploitation:** This is a valid point as all these plants have medicinal uses, making them susceptible to overharvesting.
- **(d) All are exclusively present in the Eastern Himalayas:** This is incorrect as these plants are found in various regions and are not exclusive to the Eastern Himalayas.

3. **Conclusion:**
- The correct answer is **(c) All are prone to overexploitation.** This is because their medicinal properties make them targets for harvesting, which can lead to a decline in their populations.