11. Cephalization is 16. Tapeworms do not have a (a) reproductive system (b) hea

Question

11. Cephalization is 16. Tapeworms do not have a (a) reproductive system (b) head (c) excretory system (d) digestive system (a) the division of the trunk into a scolex, neck, and body (b) the presence of a head with sense organs (c) sexual reproduction involving self-fertilization 17. The oldest proglottid of a tapeworm is (a) the scolex (b) the one nearest its neck (c) the one in its middle (d) the one at its end (d) the ability to replace lost body parts -12. Flatworms (a) are radially symmetrical (b) possess a body cavity (c) reproduce by parthenogenesis (d) have tissues derived from all three Bladder worms are found in (a) proglottids in human feces (b) proglottids in the human intestine (c) improperly cooked pork (d) none of the above 18. primary germ layers 13. Free-living flatworms (planaria) move by using 19. Nematodes and rotifers have a body (a) cilia (b) flagella (c) pseudopodia (d) a muscular foot cavity that is (a) called a coelom (b) called a pseudocoelom (c) completely lined by tissues derived 14. The flukes and tapeworms are covered by from mesoderm (d) both a and c a protective (a) cuticle (b) shell (c) scales (d) slime layer 20. Rotifers obtain their food by the action of (a) tentacles (b) cilia on the wheel organ (c) a muscular pharynx (d) pseudopodia -15. The life cycle of the human liver fluke has intermediate hosts. (a) one (b) two (c) three (d) four

Explanation / Answer

Ans 11 :b) the presence of a head with sense organs

Cephalization is an evolutionary trend in which over the time , the sense organs , mouth and the nerve ganglia concentrate at one place in the front end of the body of the organism , forming a head.

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