17. Select the statement which explains best parasitism.

(a) One organism is benefited.

(b) Both the organisms are benefited.

(c) One organism is benefited, other is not affected.

(d) One organism is benefited, other is affected.

 

One organism is benefited, other is affected.

Parasitism is an interaction between two species in which one species (parasite)

derives benefit while the other species (host) is harmed. For example, ticks and

lice (parasites) present on the human body represent this interaction where in the

parasites receive benefit (as they derive nourishment by feeding on the blood of

humans). On the other hand, these parasites reduce host fitness and cause harm to

the human body.