Question

67. Organisms in Phylum Porifera are

a. acoelomate

b. pseudocoelomate

c. coelomate

d. none of the above

68. The highest level of organization in Phylum Porifera is

a. cellular

b. tissue

c. organ

d. none of the above

69. Organisms in Phylum Cnidaria are

a. asymmetrical

b. radially symmetrical

c. bilaterally symmetrical

70. Organisms in Phylum Cnidaria are

a. diploblastic

b. triploblastic

c. neither

71. Organisms in Phylum Cnidaria are

a. protostomes

b. deuterostomes

c. neither

72. Organisms in Phylum Cnidaria are

a. acoelomate

b. pseudocoelomate

c. coelomate

d. none of the above

73. The highest level of organization in Phylum Cnidaria is

a. cellular

b. tissue

c. organ

d. none of the above

74. Organisms in Phylum Platyhelminthes are

a. asymmetrical

b. radially symmetrical

c. bilaterally symmetrical

75. Organisms in Phylum Platyhelminthes are

a. diploblastic

b. triploblastic

c. neither

76. Organisms in Phylum Platyhelminthes are

a. protostomes

b. deuterostomes

c. neither

77. Organisms in Phylum Platyhelminthes are

a. acoelomate

b. pseudocoelomate

c. coelomate

d. none of the above

78. The highest level of organization in Phylum Platyhelminthes is

a. cellular

b. tissue

c. organ

d. none of the above

79. Organisms in Phylum Nematoda are

a. asymmetrical

b. radially symmetrical

c. bilaterally symmetrical

80. Organisms in Phylum Nematoda are

a. diploblastic

b. triploblastic

c. neither

81. Organisms in Phylum Nematoda are

a. protostomes

b. deuterostomes

c. neither

82. Organisms in Phylum Nematoda are

a. acoelomate

b. pseudocoelomate

c. coelomate

d. none of the above

83. The highest level of organization in Phylum Nematoda is

a. cellular

b. tissue

c. organ

d. none of the above

84. Plathelminths and nematodes are both considered ‘worms’, yet they are placed in different clades or taxonomic groups (see Figure 18.4 on page 373). What is a ‘worm’? Does being a worm mean you are closely related to other worms? Why or why not? (5)

85. Why does it make sense for a cnidarian to be radially symmetrical? (2)

88. Why does it make sense for a worm to be bilaterally symmetrical? (2)

Answer 1

67. a.acoelomate,as Porifera has no coelom or a pseudocoelom, a body cavity not lined with mesodermal cells.

68. a. Cellular

69. b.radially symmetrical, Cnidarians have a radially symmetrical cup or bag like body madeup of two layers of cells.

70. a.diploblastic,Cnidarians are diploblastic in nature, that is ,they have two germ layers.

71.b.deuterostomes, Animals in which the coelomforms from pouch of endoderm.

72. a. acoelomate,as they have no true body cavity.

73. b. tissue

74. c. bilaterally symmetrical

75. b. triploblastic, the body has three tissue layers

76. a. protostomes,

77. a. acoelomate,that is having no coelom, or fluid-filled body cavi