8. Trematodes like the liver fluke inhabit humans and other vertebrates Why do p

Question

8. Trematodes like the liver fluke inhabit humans and other vertebrates Why do public health workersworny about n population size in relation to human infections? A. the snails are a site of asexual multiplication in the fluke Ife cycle s. the snails are an alternate host for the adult flukes C the sails feed on the flukes and keep the population down D. the snails compete with the flukes to infect humans E. the snals are the final host for the adult flukes 9. Gastropods communicate with each other chemically for example, in some and snails follow the scent toward the mating group Natural selection favored a different means of communication in takes place n large ngton cephalopods. What was favored? A. vocal signaling systems 8. tactile signaling systems C visual signaling systems O. pheromone based signaling systems E. are alone most of the time 10. Why is it important that gastropods maintain a one way flow through the mantle cavity? A. to bring in fresh water for feeding B. to swim rapidly C. to cleanse wastes from the gills and head D. to make sure that the larva disperse away from the parents E. to make sure that sperm are spread over a wide area 11. When one thinks about metazoan origins, one of the questions that comes up is the form of the stem group or the ancestral group. Based on the shared presence of the 9 (2) + 2 microtubule arrangement, to which of the following groups might the common ancestor of the metazoans have belonged? A. bacteria B. flagellate protozoans C ciliate protozoans D. b & C E. a, b& c 12. Zoologists used to refer to animals as "simple" and "advanced." Now it is more scientifically accurate to use A "simple" and "complex," since it is the complexity that evolved. Ie B. "allopatric" and "sympatric," since the reproductive isolation of the species is most important. C "evolved" and "un-evolved," since everything ties together with evolution. D. "ancestral" and "derived them but lost complex characters and secondarily became more "simple" 13. Two different monophyletic taxa are termed_if they share common ancestry with either one does with another taxa. A. outgroups .B. sister groups C. sibling species D. paraphyletic compatible with cladistic 14. Which kingdom in Whittaker's five-kingdom system must be discontinued and broken up to be systematics? A. Plantae B. Fungi C. Animalia D. Protista

Explanation / Answer

Q.8. Answer A, Asexual reproduction takes place in the snail and leads to the formation of motile larva, namely, cercaria, that has the capability to penetrate the skin and blood vessels of the human beings.

Q.9. Ans  C, Visual Signaling system. Almost all the cephalopods have camera-like eyes. They are the most brainy invertebrates.

Q.10. Ans. C to cleanse water from the gills and the head.

Q.11. Ans. B flagellate protozoans seems the promising answer amongst the given options.

Q.12. Ans. D

Q.13. Ans. D. Paraphyletic

Q.14. Ans. C Animalia

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