Which of the following is a unisexual organism?
(a) Earthworm
(b) Leech
(c) Human
(d) Hydra

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Detailed Solution

The correct answer is (c) Human

A unisexual organism is one that has separate male and female individuals — meaning the two sexes are distinct, and reproduction requires a male and a female.

Humans are unisexual organisms because:

Males have testes that produce sperms.
Females have ovaries that produce eggs.
Fertilization occurs when sperm and egg fuse, leading to the formation of a zygote.
Since both sexes are separate, reproduction in humans always requires two parents — one male and one female.

Why Not the Other Options?

Earthworm: Hermaphrodite (bisexual) — each individual has both male and female reproductive organs.
Leech: Also hermaphrodite — possesses both sets of reproductive organs.
Hydra: Can reproduce both asexually (by budding) and sexually, but most are hermaphroditic, having both male and female gametes in the same organism.

Thus, humans are a classic example of unisexual organisms where sexes are separate.

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