Question 1

Which clade is characterized by having no true tissues and lacking germ layers?

Accepted Answer

Porifera

Question 2

A biologist discovers an animal with bilateral symmetry, three germ layers, and a complete digestive tract. Which clade is this animal most likely to belong to?

Accepted Answer

Nematoda

Question 3

Which of the following clades is a deuterostome?

Accepted Answer

Echinodermata

Question 4

Which clade is defined by having a water vascular system and radial symmetry in adults?

Accepted Answer

Echinodermata

Question 5

Which clade possesses segmentation, a closed circulatory system, and is a protostome?

Accepted Answer

Annelida

Question 6

A marine biologist is studying an organism with two digestive openings, bilateral symmetry, and an open circulatory system. Which clade does this organism most likely belong to?

Accepted Answer

Mollusca/Bivalvia

Question 7

Which clade is unique for having a mantle, a muscular foot, and a radula (except for bivalves)?

Accepted Answer

Mollusca

Question 8

Which clade is characterized by having a single digestive opening and being triploblastic?

Accepted Answer

Platyhelminthes

Question 9

Which of the following clades is NOT segmented?

Accepted Answer

Mollusca/Bivalvia

Question 10

Which clade is defined by having jointed appendages, an exoskeleton made of chitin, and an open circulatory system?

Accepted Answer

Arthropoda

Question 11

Which clade is diploblastic and has radial symmetry?

Accepted Answer

Cnidaria

Question 12

Which clade is characterized by having a notochord, dorsal nerve cord, and pharyngeal slits at some stage of development?

Accepted Answer

Chordata

Question 13

Which clade is defined by being acoelomate and having bilateral symmetry?

Accepted Answer

Platyhelminthes

Question 14

Which clade is a protostome and has a closed circulatory system?

Accepted Answer

Annelida

Question 15

Which clade is defined by having a pseudocoelom and a complete digestive tract?

Accepted Answer

Nematoda

Question 16

Which clade is characterized by having a closed circulatory system and a highly developed nervous system, including a large brain?

Accepted Answer

Mollusca/Cephalopoda

Question 17

Which clade is defined by having no body cavity (acoelomate), but is triploblastic?

Accepted Answer

Platyhelminthes

Question 18

Which clade is defined by being deuterostome, having segmentation, and a dorsal nerve cord?

Accepted Answer

Chordata

Question 19

Which clade is defined by having a mantle cavity, two shells, and filter-feeding as a primary mode of nutrition?

Accepted Answer

Mollusca/Bivalvia

Question 20

Which clade is defined by having a hydrostatic skeleton, segmentation, and a complete digestive tract?

Accepted Answer

Annelida

Comparative Characteristics of Major Animal Clades

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