Question 7 Which of the following description best describes an animal in the ph

Question

Question 7 Which of the following description best describes an animal in the phylum Cnidaria? A. Radially symmetrical, with two embryonic tissue layers and a well developed brain. B. Radially symmetrical, with two embryonic tissue layers and an incomplete gut. C. Radially symmetrical, with three embryonic tissue layers and an incomplete gut. D. Asymmetrical, with two embryonic tissue layers and a gastrovascular cavity. Bilateral symmetry, two embryonic tissue layers and a complete digestive tract. Question 8 The animals in the photograph below are sessile adults. However, as larvae they swim using a post-anal tail. To which taxon do they belong? A. Cnidaria B. Cephalochordata C. Porifera D. Urochordata E. Hirudinea Question 9 Which of the following is a characteristic of adult echinoderms? A, secondary radial symmetry B. spiral cleavage C. gastrovascular cavity D. exoskeleton E. lophophore Question 10 I am a small animal that lives in the spaces between soil particles. My many, many friends and I make short work of rotting fruit such as the fallen apples under a tree. I have a body cavity that is not completely surrounded by mesodermally derived tissue. I have a thin, flexible covering the helps protect me. Who am l? A. A segmented worm B. A round worm C. A flat worm D. A maggot (fly larva) E. A tube worm

Explanation / Answer

7. these are radially symmetrical, three body layers and an incomplete gut (the provision for ingestion and ejection are at either ends of the same tube)

8. c.Porifera.

9. d. a thorny exoskeleton as that of the hedge-hog's

10. 10. a. a segmented worm also known as earth worm

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