chapter 32

Question 1

which of the following is NOT a unique characteristic of all chordates at some time in their life history?

Answer 1

radial symmetry

Question 2

defining characteristics of chordates are

Answer 2

gill arches or pharyngeal pouches, dorsal tubular nerve cord, notochord, and postanal tail

Question 3

which of the following sequences correctly represents vertebrate evolution?

Answer 3

jawless fish - lobe-finned fish - amphibians - reptiles - mammals

Question 4

in vertebrates, the ___ is/are usually replaced by ___

Answer 4

notochord; a vertebral column

Question 5

which represents the correct order of evolution of chordate features?

Answer 5

vertebrae - jaws - lungs - limbs - amnion

Question 6

what is the correct evolutionary pathway for the key features of chordates?

Answer 6

notochord - vertebrae - jaws - bony skeleton - lungs - 4 limbs - amniotic egg - mammary glands

Question 7

jaws are believed to have evolved from the

Answer 7

first pair of gill arches

Question 8

the lancelets are found

Answer 8

commonly in the sandy bottoms of shallow coastal waters around the world

Question 9

which of these is NOT a characteristic of a shark?

Answer 9

a sucker used to attach to prey

Question 10

sharks

Answer 10

have a keen sense of smell

Question 11

of the following, the most recent ancestor of amphibians would be

Answer 11

coelacanth

Question 12

which of these characteristics is NOT found in the amphibians but it is developed in reptiles?

Answer 12

internal fertilization

Question 13

which of these characteristics first developed in reptiles?

Answer 13

amniotic egg

Question 14

which of the following features was NOT necessary or adaptation by reptiles of life on land?

Answer 14

being cold-blooded

Question 15

mammals are different from birds in all these characteristics EXCEPT

Answer 15

maintaining a constant body temperature

Question 16

which of the following features is NOT a characteristic used to distinguish birds?

Answer 16

body temperature that varies with environment

Question 17

an animal that is characterized by vertebrae, dorsal hollow nerve cord, hair, and mammary glands must be a

Answer 17

mammal

Question 18

the chief distinguishing characteristic of all mammals is the presence of

Answer 18

hair and mammary glands

Question 19

all mammals have an embryo that develops with a placenta

Answer 19

false

Question 20

tiktaalik roseae is considered to be a transitional form between

Answer 20

lobe-finned fish and amphibians

Question 21

the juvenile amphibian generally hatches from an egg and develops

Answer 21

in water

Question 22

primates have characteristics like opposable thumbs and toes, arms that can reach in almost any direction, and stereoscopic vision with eyes at the front of the face rather than sides of the head. this characteristics are thought to be well adapted to life

Answer 22

in trees