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Which one of the following is categorised as a parasite in true sense?

1. The female Anopheles bites and sucks blood from humans
2. Human foetus developing inside the uterus draws nourishment from the mother
3. Head louse living on the human scalp as well as laying eggs on human hair
4. The cuckoo (koel) lays its eggs in crow’s nest

Correct answer: Head louse living on the human scalp as well as laying eggs on human hair

Solution

The head louse is a classic ectoparasite: it lives on the human scalp, feeds on the host, and completes its life cycle there. The other options describe blood-feeding, temporary dependence, or brood parasitism, which are not the same as a true parasite in this sense.

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