Q. Which one of the following is categorised as a parasite in true sense?
A) The cuckoo (koel) lays its egg in crow's nest
B) The female Anopheles bites and sucks blood from humans
C) Human foetus developing inside the uterus draws nourishment from the mother
D) Head louse living on the human scalp as well as laying eggs on human hair
Explanation
[Solution from source] The head louse lives on the host's scalp, lays its eggs on the hair and feeds on the host throughout its life, a true ectoparasite. The cuckoo is a brood parasite, the female Anopheles only visits to feed, and the foetus is not a separate parasitic organism. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.