Question 1

Which of the following is a key adaptation that distinguishes tetrapods from their fish ancestors?

Accepted Answer

Development of four limbs with digits

Question 2

Which structure is unique to amniotes and was crucial for their adaptation to terrestrial life?

Accepted Answer

Amniotic egg

Question 3

In the evolutionary tree of deuterostomes, which group is the immediate ancestor of vertebrates?

Accepted Answer

Cephalochordata

Question 4

Which of the following is NOT a characteristic of all modern tetrapods?

Accepted Answer

Presence of respiratory gills in adults

Question 5

Which group of amphibians is characterized by being legless, nearly blind, and having chemosensory tentacles?

Accepted Answer

Gymnophiona (caecilians)

Question 6

Paedomorphosis, the retention of juvenile features in the adult, is commonly observed in which amphibian group?

Accepted Answer

Salamanders

Question 7

Which of the following best describes the function of the amnion in the amniotic egg?

Accepted Answer

Protects the embryo in a fluid-filled cavity

Question 8

Which of the following statements about the evolutionary history of tetrapods is correct?

Accepted Answer

Tetrapods evolved from a clade of lobe-finned fishes

Question 9

Which of the following is a major cause of recent amphibian population declines worldwide?

Accepted Answer

Chytrid fungal pathogens

Question 10

Which of the following is a derived trait that unites all amniotes?

Accepted Answer

Amniotic egg with extraembryonic membranes

Question 11

A scientist discovers a fossil vertebrate with a humerus, radius, and ulna in its fin. To which group is this fossil most closely related?

Accepted Answer

Lobe-finned fishes and early tetrapods

Question 12

Which of the following best explains why not all frogs go through a bi-phasic life cycle (aquatic larva and terrestrial adult)?

Accepted Answer

Some frogs exhibit direct development, hatching as miniature adults

Question 13

Which of the following is true about the evolutionary relationship between frogs, salamanders, and caecilians?

Accepted Answer

Frogs and salamanders are more closely related to each other than to caecilians

Question 14

Which adaptation allows some frog species, such as Rana sylvatica, to survive freezing temperatures?

Accepted Answer

Use of blood sugar and urea to limit ice crystal formation

Question 15

Which of the following is NOT a function of the extraembryonic membranes in the amniotic egg?

Accepted Answer

Facilitating external fertilization

Question 16

Which of the following best describes the evolutionary significance of Tiktaalik roseae?

Accepted Answer

It exhibits both fish and tetrapod characteristics

Question 17

Which of the following is a correct sequence of evolutionary innovations in vertebrates, according to the cladogram?

Accepted Answer

Jaws → Lungs → Limbs with digits → Amniotic egg

Question 18

Which of the following is a plausible reason why amphibian eggs require a moist environment?

Accepted Answer

They lack a shell and are prone to desiccation

Question 19

Which of the following is a correct statement about the diversity of amniotes?

Accepted Answer

Amniotes include reptiles, birds, and mammals

Deuterostomes Part 2: Tetrapods – Structure, Evolution, and Diversity

Study Guide - Practice Questions