1. A parasite trematode begins its life cycle in a snailwhere it hatches. The sn

Question

1.      A parasite trematode begins its life cycle in a snailwhere it hatches. The snail nourishes the trematode into a swimminglarva and leaves the snail and enters the California killifish. Bytraveling to the killifish’s brain the behavior of thekillifish is altered, moving jerkily near the water’ssurface. This behavior attracts the attention of thekillifish’s predator, the great blue heron. The trematodewill then reproduce in the gut of the heron completing its lifecycle. Trematode eggs are deposited with heron feces in the waterwhere they will be picked up by snails. How might such a complexlife cycle have evolved?

Explanation / Answer

answer : 1. the life cycle pattern of the digenetic trematodes is quitecomplex, involving first- and second-stage larvae 2. Upon hatching, the first-stage larvae, miracidia, infect thefirst intermediate host, usually a mollusk. 3. Many miracidia take advantage of light and gravitational cues toreach an area suitable to their hosts, 4 In trematode species, the egg does not develop untilit is eaten by the host species.

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