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11.Organisms and Populations
medium
Which one of the following is categorised as aparasite in true sense?
A
The female Anopheles bites and sucks blood from humans
B
Human foetus developing inside the uterus draws nourishment from the mother
C
Head louse living on the human scalp as well as laying eggs on human hair
D
The cuckoo (koel) lays its eggs in crow’s nest.
(AIPMT-2011)
Solution
(c) : Parasitism is an association in which one organism (the parasite) lives on (ectoparasitism) or in (endoparasitism) the body of another (the host), from which it obtains its nutrients. They also produce vast numbers of eggs there $e.g.$, head louse living on the human scalp.
Standard 12
Biology
