Question 1

Which of the following is a shared derived developmental characteristic of all deuterostomes, including echinoderms and chordates?

Accepted Answer

Radial and indeterminate cleavage during embryogenesis

Question 2

A marine biologist discovers an aquatic animal with five rows of tube feet, a spherical body, and movable spines. To which echinoderm clade does this animal most likely belong?

Accepted Answer

Echinoidea

Question 3

Which of the following best describes the function of the water vascular system in echinoderms?

Accepted Answer

It is used for locomotion and feeding via tube feet

Question 4

Sea stars can regenerate lost arms. Which of the following best explains the evolutionary advantage of this trait?

Accepted Answer

It enables them to escape predators and recover from injury

Question 5

Which of the following is NOT a characteristic shared by all chordates at some point in their life cycle?

Accepted Answer

Exoskeleton

Question 6

A student observes an animal with a disk-shaped body, no arms, and five rows of tube feet. Which clade does this animal most likely belong to?

Accepted Answer

Echinoidea

Question 7

Which of the following statements about echinoderm symmetry is correct?

Accepted Answer

Echinoderm larvae have bilateral symmetry, while adults appear radially symmetrical

Question 8

Which subphylum of chordates retains all four chordate characteristics throughout its life?

Accepted Answer

Cephalochordata

Question 9

Which of the following is a function of pharyngeal slits in chordates?

Accepted Answer

Gas exchange and filter feeding

Question 10

A researcher finds an animal with a stalk attaching it to the substrate and feathery arms used for suspension feeding. To which echinoderm clade does this animal belong?

Accepted Answer

Crinoidea

Question 11

Which of the following best describes the difference between Asteroidea and Ophiuroidea?

Accepted Answer

Asteroidea have arms radiating from a central disk; Ophiuroidea have long, flexible arms distinct from the central disk

Question 12

Which of the following is true about the development of deuterostomes?

Accepted Answer

Cleavage is radial and indeterminate

Question 13

Which echinoderm class is characterized by an elongated body, reduced endoskeleton, and tube feet modified as feeding tentacles?

Accepted Answer

Holothuroidea

Question 14

Which of the following is a correct pairing of echinoderm clade and example organism?

Accepted Answer

Asteroidea – sea star

Question 15

Which of the following is a unique feature of the water vascular system in echinoderms?

Accepted Answer

It branches into tube feet used for locomotion and feeding

Question 16

Which of the following is a shared ancestral character of all deuterostomes?

Accepted Answer

Radial and indeterminate cleavage

Question 17

Which of the following best explains why sea daisies are considered part of the clade Asteroidea?

Accepted Answer

They are disk-shaped with five-sided organization and absorb nutrients through a membrane

Question 18

Which of the following is true about the adult tunicate (Urochordata)?

Accepted Answer

It is sessile or planktonic and lacks a notochord as an adult

Question 19

Which of the following is a correct statement about the evolutionary relationship between echinoderms and chordates?

Accepted Answer

They both belong to the clade Deuterostomia

Question 20

Which of the following is a function of the tube feet in sea stars?

Accepted Answer

Locomotion and prying open bivalves

Echinoderms and Chordates: Deuterostome Diversity and Development

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