Biodiversity - Mammals

Question 1

number of mammal species

Answer 1

4500

Question 2

features of a mammal

4

Answer 2

• endothermic
• hair
• mammary glands for milk
• 4 chmabered heart

Question 3

why do mammals have hair

Answer 3

to keep heat they produce by insulating body

Question 4

2 types of hair

Answer 4

• under hair - insulation
• guard hair - protection

Question 5

features of hair

4

Answer 5

• made of keratin
• grows out of follicle
• oil gland
• tiny muscle pulls hair up when cold

Question 6

examples of modified hair

4

Answer 6

• quills - defence
• scales - water loss
• whiskers - sensory
• horn - protection

Question 7

how do sounds reach brain

Answer 7

1. sound enters auditory canal
2. then middle ear
3. waves pass through malleus, inus then stapes
4. cochlea sends signal to brain

Question 8

4 types of mammalian teeth

Answer 8

• incisors
• canies
• premolars
• molars

Question 9

what do incisor teeth do

Answer 9

cut or shear food

Question 10

why did mammals not go extinct with dinosaurs

Answer 10

bc of hair and fat which insulated them during cooler temp

Question 11

age of oldest mammalian fossils

Answer 11

220 million years old

Question 12

4 types of placental mammals

MELAX

Answer 12

• euarchontoglires
• laurasiatheria
• afrotheria
• xenarthra

Question 13

what are monotremes?

Answer 13

mammals that lay eggs

Question 14

monotreme features

Answer 14

• reptile and mammal characteristics
• lay eggs
• have cloaca
• hair
• mammary glands (no nipples)

Question 15

2 examples of montremes

Answer 15

• platypus
• echidna

Question 16

3 marsupial features

Answer 16

• have egg and placenta
• short gestation
• young climb into marsupium pouch

Question 17

what are placental mammals

Answer 17

complete development in the uterus, in the placenta

Question 18

2 examples of afrotheria

Answer 18

• elephants
• manatees

Question 19

3 examples of xenarthra

Answer 19

• sloths
• armadillos
• anteaters

Question 20

1 feature of xenarthra

Answer 20

• have no teeth

Question 21

types of laurasiatheria and example

IBCCAP

Answer 21

• insectivores - hedgehogs
• bats
• carnivores - tiger
• cetaceans - whale
• artidactyls - pigs, deer
• perissodactyls - horses, rhinos

Question 22

how have carnivores specialised?

Answer 22

specalised teeth

Question 23

3 features of artiodactyls

Answer 23

• even toed
• 4 chambered stomach
• weaponary

Question 24

3 features of perissodactyls

Answer 24

• odd toed
• single stomach
• lophodont grinding molars

Question 25

how are rabbit and hare teeth specalised?

2

Answer 25

• open cavity
• teeth keep growing (hypsodont)

Question 26

what is different about rodents (digestion)?

Answer 26

pass food twice