Q1. Which is not a parasite ?
(a) Tick
(b) Housefly
(c) Bed bug
(d) Louse
(UPSC Prelims 1984)
Answer: (b) Housefly
Explanation: A parasite lives on or inside a host and derives nutrients at the host’s expense.
- Tick, bed bug, and louse are true parasites.
- The housefly, however, is a vector, not a parasite—it transmits diseases but does not feed directly on a host in a parasitic manner.
