Question 1

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

Accepted Answer

Exoskeleton made of chitin

Question 2

Sea squirts (tunicates) are classified in which subphylum of Chordata?

Accepted Answer

Urochordata

Question 3

Which structure is present in the larval stage of tunicates but lost in the adult stage?

Accepted Answer

Notochord

Question 4

Amphioxus (Branchiostoma) is an example of which subphylum?

Accepted Answer

Cephalochordata

Question 5

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

Accepted Answer

Gas exchange and feeding

Question 6

The amniotic egg, shown in the diagram, is an evolutionary adaptation that allows for:

Accepted Answer

Terrestrial reproduction by preventing desiccation

Question 7

Which class of vertebrates is characterized by the presence of a pentadactyl limb?

Accepted Answer

Amphibia

Question 8

Which of the following fish is jawless?

Accepted Answer

Lamprey

Question 9

What is the main difference between cartilaginous fish and bony fish?

Accepted Answer

Cartilaginous fish have skeletons made of cartilage, bony fish have skeletons made of bone

Question 10

Which of the following is a unique feature of vertebrates compared to other chordates?

Accepted Answer

Vertebral column (backbone)

Question 11

A researcher finds an aquatic animal with a notochord, segmented muscles, and pharyngeal slits, but no jaws or paired fins. Which group does this animal most likely belong to?

Accepted Answer

Jawless fish

Question 12

Which of the following best describes the feeding mechanism of adult sea squirts (tunicates)?

Accepted Answer

Filter feeding using pharyngeal slits

Question 13

Which of the following is true about the evolutionary significance of the notochord?

Accepted Answer

It provides structural support and is a precursor to the vertebral column

Question 14

Which class of vertebrates was the first to evolve the amniotic egg?

Accepted Answer

Reptilia

Question 15

Which of the following animals is an example of a lobe-finned fish?

Accepted Answer

Coelacanth

Question 16

Which adaptation allows reptiles to reproduce successfully on land?

Accepted Answer

Amniotic egg

Question 17

Which of the following is a characteristic of all members of the subphylum Vertebrata?

Accepted Answer

Presence of a vertebral column

Question 18

Which of the following best explains why amphibians are restricted to moist environments?

Accepted Answer

Their skin is permeable to water and they require water for reproduction

Question 19

Which of the following is a diagnostic feature of the class Aves (birds)?

Accepted Answer

Feathers and a beak without teeth

Question 20

Which of the following is a correct sequence of evolutionary events in chordate history?

Accepted Answer

Notochord → development of jaws → amniotic egg

Phylum Chordata: Structure, Diversity, and Evolution

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