class reptilia

Question 1

what organisms does the class include?

Answer 1

lizards, snakes, turtles, birds, crocodilians

Question 2

what are their scales/feathers made of and what are they protected from?

Answer 2

made of keratin which protects them from desiccation and abrasion

Question 3

how does fertilization occur?

Answer 3

internally, shelled eggs are laid on land

Question 4

what is the relationship b/w crocodiles and birds?

Answer 4

crocodiles are more closely related to birds than other reptiles (both take care of young)

Question 5

what is ectothermic?

Answer 5

behavioral adaptations regulate body temp (birds are endothermic which facilitates flight)

Question 6

what are the main physical characteristics of turtles? (3)

Answer 6

1) external shell covered in keratin
2) carapace formed from fusion of vertebrate
3) keratinized beak

Question 7

what is the pastron of a turtle?

Answer 7

ventral portion that forms from bones of pectoral girdle and dermal bone

Question 8

what are derived characters for birds that are adaptations for flight? (4)

Answer 8

1) no urinary bladder
2) one ovary
3) toothless
4) honeycombed bones

Question 9

how do the derived characters of birds help facilitate flight?

Answer 9

makes them lighter

Question 10

what may have feathers been originally for?

Answer 10

insulation/camouflage, flight is secondary use

Question 11

what is archaeopteryx?

Answer 11

most important fossil that have both reptile and bird characteristics

Question 12

how is this lineage significant?

Answer 12

marks divergence from reptiles to birds