Birds

Question 1

What is an amnion and what is its function?

Answer 1

The extra-embryonic member enclosing an amniote embryo in a fluid filled sac.

Question 2

What are the characteristics of birds?

Answer 2

Feathers
Beak
Gizzard
Greatly enlarged sternum
Light skeleton & toes that they walk on
Air sacs – thin-walled bags extending through body cavity

Question 3

Discuss three ways in which birds have been adapted for efficient flight.

Answer 3

light bone density
feathers for air resistance
air sacks to breathe 
wings
streamlined body

Question 4

why is preening important

Answer 4

aligning feathers for optimum waterproofing/insulation
aligning feathers into most aerodynamic shape for efficient flight
removing feather parasites and body lice that can destroy feathers or carry disease
creating healthier appearance to attract a mate
bonding between mates as a courtship ritual that involves mutual preening, called allopreening

Question 5

What are the advantages and disadvantages for birds of laying eggs?

Answer 5

Shell protects baby,

eggs can be easily taken by predators