Page 114-115 11 Terms

Question 1

Down feather

Answer 1

The down of birds is a layer of fine feathers found under the tougher exterior feathers.

Question 2

Contour feather

Answer 2

Any of the mainly small feathers that form the outline of an adult bird’s plumage.

Question 3

Preening

Answer 3

straighten and clean its feathers with its beak.

Question 4

Lift

Answer 4

The lift force, lifting force or simply lift is the sum of all the forces on a body that force it to move perpendicular to the direction of flow.

Question 5

Brooding

Answer 5

Brooding, in zoology, pattern of behaviour of certain egg-laying animals, especially birds, marked by cessation of egg laying and readiness to sit on and incubate eggs.

Question 6

Mammary glands

Answer 6

Any of the milk-producing glands in female mammals, consisting of lobes containing clusters of alveoli with a system of ducts to convey the milk to an external nipple or teat.

Question 7

Diaphragm

Answer 7

a dome-shaped, muscular partition separating the thorax from the abdomen in mammals. It plays a major role in breathing, as its contraction increases the volume of the thorax and so inflates the lungs.

Question 8

Monotremes

Answer 8

a primitive mammal that lays large yolky eggs and has a common opening for the urogenital and digestive systems.

Question 9

Marsupial

Answer 9

a mammal of an order whose members are born incompletely developed and are typically carried and suckled in a pouch on the mother’s belly.

Question 10

Placental mammal

Answer 10

any member of the mammalian group characterized by the presence of a placenta.

Question 11

Gestation period

Answer 11

Fetal development period from the time of conception until birth. For humans, the full gestation period is normally 9 months.