Q. The type of relationship in which one organism is benefited while there is no effect on other is

Explanation by: Official MCQ Buddy

Commensalism is a type of relationship in which one organism benefits while the other remains unaffected (neither harmed nor benefited).
(A) Symbiosis – A broad term that includes various relationships like mutualism, commensalism, and parasitism.
(B) Mutualism – Both organisms benefit from the relationship (e.g., bees and flowers).
(D) Parasitism – One organism benefits while the other is harmed (e.g., ticks on dogs).
An example of commensalism is barnacles on whales—barnacles get a place to live and filter food from the water, but the whale is not affected.