Class Aves

Question 1

Key Adaptions That Provide Power For & Reduce Body Weight For Flight.

In terms of bones
In terms of skeleton
In terms of circulatory & respiratory system
In terms of eyes
In terms of teeth and bill
In terms of neck

Answer 1

1. Hollow limb bones
2. The skeleton is light and rigid
3. Efficient circulatory and respiratory system
4. Well developed eyes
5. Birds lack teeth & acquires food with light weight, keratinized bill
6. Long flexible neck which allows them to use their bill for feeding, grooming nest building and social interactions

Question 2

Facts About Aves

In terms of habitat & respiratory organ
In terms of movement
In terms of limbs
In terms of front pair of limbs
In terms of parental care
In terms of mode of reproduction, type of reproduction and fertilization

Answer 2

They are primarily terrestrial animals with their respiratory organ being lung
Most birds fly; Pigeons, Some are running birds; Ostriches, Some are swimming & diving; Ducks
Their limbs exhibit pentadactyl arrangement, though the number is usually reduced to about 3 or 4
Front pair of limbs are adapted to form wings to fly.
They show parental care for the young ones
They exhibit oviparous mode of reproduction as reproduction is sexual and fertilization is internal.

Question 3

Facts About Aves

In terms of development
In terms of skin and their leg’s covering
In terms of red blood cells
In terms of body temperature
In terms of heart chamber
In terms of bones

Answer 3

No larva stage i.e development is direct
Skin is dried and covered with feathers except on the leg where scales are present
The red blood cells are ovoid and nucleated.
The body are warm-blooded (i.e homeothermic)
They have a four chambered heart (Two ventricles & Two Auricles).
They have rigid and hollow bones with air sacs which makes them light during flight.