Question

Which one of the following can be 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 and draws nourishment from the mother.
• D. Head louse living on the human scalp as well as laying eggs on human hair.

Answer 1

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

Parasitism is considered when an organism depends on other (host) for the food and shelter. Head louse feeds on the blood of humans from the scalp gets nutrition and shelter and also increase its generation. Thus, the correct answer is option D.