5. Of the an mals listed below, all but the a) molluscs are bilaterally symmetri

Question

5. Of the an mals listed below, all but the a) molluscs are bilaterally symmetrical b) arthropods c) echinoderms d) nematodes 6. The were the first major group of coelomate animals to appear. 7. Which of the animals listed below are deuterostomes? 8. The phylum with the largest number of species are the 9. Which of the following animals is not a protostome? a) chordates b) molluscs c) echinoderms d) nematodes a) cnidarians b) star fish c) roundworms d) flatworms a) nematodes b) arthropods c) flatworms d) cnidarians c) annelids d) echinoderms b) arthropods b) jellyfish b) jellyfish a) molluscs 10. Theare the simplest animals in which symmetry occur a) sponges c) flatworms d) roundworms , are organized into tissues c) flatworms 11. cells of all animals but d) roundworms a) sponges 12. The most successful land animals are the d) arthropods a) protozoans b) amphibians c) molluscs A pseudocoel is a body cavity bounded by d) endoderm and mesoderm b) mesoderm c) ectoderm a) endoderm

Explanation / Answer

Ans 5 : c) echinoderms

Of the animals listed below,all but the echinoderms are bilaterally symmetrical.

When the organisms can be split into symmetrical halves by a unique plane , they are said to be bilaterally symmetrical.

The larvae of echinoderms are bilaterally symmetrical , but they lose this characteristic during the metamorphosis.

So the members of this phylum are not bilaterally symmetrical infact radially symmetrical such as sea stars.

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