Q. Which one of the following is most appropriately defined?
A) Host is an organism which provides food to another organism
B) Amensalism is a relationship in which one species is benefited whereas the other is unaffected
C) Predator is an organism that catches and kills other organism for food
D) Parasite is an organism which always lives inside the body of other organism and may kill it
Explanation
[Solution from source] A predator catches and kills its prey for food, which is the standard definition. One species benefiting while the other is unaffected is commensalism, not amensalism (one harmed, other unaffected). Parasites may be external (lice, ticks) and generally do not kill the host, and 'host' refers to the organism a parasite lives on, not any food provider. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.