Approach: Evaluate the botanical characteristics, geographical distribution, and cultural significance of the Foxtail orchid to verify its status as an epiphyte and its state-level recognition.
- **Correct Answer:** (b) 1 and 3
- **Statement 1 is correct:** *Rhynchostylis retusa* is an epiphytic orchid, meaning it grows on the surface of trees, deriving moisture and nutrients from the air, rain, and debris accumulating around it.
- **Statement 3 is correct:** It is officially designated as the State flower of both Arunachal Pradesh and Assam. In Assam, it is famously known as 'Kopou Phool' and holds immense cultural importance during the Rongali Bihu festival.
- **Why Statement 2 is incorrect:** The species is not endemic to North-east India. It has a wide distribution range extending across South and Southeast Asia, including countries like Thailand, Myanmar, the Philippines, Indonesia, and Sri Lanka, in addition to parts of the Indian subcontinent.