Lab 13 - Chordata III

Question 1

mastication

Answer 1

chewing to break down food

Question 2

most mammals have heterodont dentition, meaning…

Answer 2

differently-shaped teeth for different functions

Question 3

plantigrade

Answer 3

species are those that place the full length of their foot on the ground during each stride

Question 4

digitigrade

Answer 4

species that walk with most of the length of their digits, but not the soles of their feet in contact with the ground

Question 5

unguligrade

Answer 5

species that walk on their tiptoes, often on hooves

Question 6

examples of plantigrade animals

Answer 6

humans and bears

Question 7

examples of digitigrade animals

Answer 7

dogs and cats

Question 8

examples of unguligrade animals

Answer 8

deer and horses

Question 9

Clade Monotremata has what kind of animals? (2)

Answer 9

platypus and echidna

Question 10

what are the only oviparous mammals?

Answer 10

Clade Monotremata

Question 11

Clade Metatheria has what kind of animals?

Answer 11

marsupials

Question 12

what kind of birth does Clade Metatheria have?

Answer 12

viviparous (live birth)

Question 13

where do babies of Clade Metatheria finish development?

Answer 13

marsupium

Question 14

Clade Eutheria contains what kind of animals?

Answer 14

placental mammals

Question 15

what kind of birth do members of Clade Eutheria have?

Answer 15

viviparous with placenta

Question 16

What common feature of Aves’ bones has made flight possible?

Answer 16

hollowed bones

Question 17

What traits in Aves is not an adaptation for flight?

Answer 17

number of openings in the skull

Question 18

What adaptations do members of Aves have for flying? (3)

Answer 18

air sacs, feathers, lack of urinary bladder

Question 19

What is a characteristic that distinguishes Crocodilia from Lepidosauria?

Answer 19

the number of chambers in the heart

Question 20

What group is most closely related to Aves?

Answer 20

Archosauria - extinct Dinosauria

Question 21

what structure of Mammalia is homologous to scales?

Answer 21

hair

Question 22

what is the function of hair?

Answer 22

provides insulation and helps to maintain body temp

Question 23

members of Mammalia also have this gland that secretes milk for their young.

Answer 23

mammary glands

Question 24

what kind of heart do members of Mammalia have?

Answer 24

four chambered heart

Question 25

What characteristic distinguishes Metheria from Eutheria?

Answer 25

the presence of a yolk-sac placenta (in Metatheria)

Question 26

What kind of skull is found in Mammalia?

Answer 26

synapsid