Answer on Zoology Question for Sanjukta Ghosh
By Eric Loker, Bruce Hofkin)
Anophles is a definitive host of plasmodium in which the fertilisation is occuring. But I don't understand what is meant by sexual maturity? It would be great if you could explain the determination of definitive host depending on the sexual maturity of a parasite with example.
The other example is beef tapeworm. It is a flatworm, which resides in the human intestine when sexually mature. Thus, human is a definitive host. The worms in the human intestine reproduce sexually, and the fertilized eggs are released with feces. The eggs preserve in soil for days, and if cattle occasionally engulfs them, the fertilized eggs develop in the intestines through several stages and become larvae. They cross the wall of the intestines, and get into muscle tissue with blood flow. There it resides in the form of cysticerci and does not perform sexual reproduction. Thus, cattle is the intermediate host. If human eats the infected meat, the larva develop into the adult worms inside the human intestine, where sexual reproduction takes place, and the cycle repeats.
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