Question

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 lying eggs on human hair.

Answer 1

The correct option is D Head louse living on the human scalp as well as lying eggs on human hair.

Koel leaving her young ones in crow's nest is a type of brood parasitism where, certain organisms use other host individuals to raise their young ones.
The mosquito does not need blood to reproduce, they lay their eggs in water. Female mosquito only feed on blood. A parasite is a creature that cannot live/breed without host and completely depending on another organism.
Louse living in the human scalp is a true parasite as it lays its eggs there and even reproduce there.
Thus, the correct answer is option D.