1
Question
Which of the following is found only in birds?
Which of the following is found only in birds?
Open in App
Solution
The correct option is D Beak
Class Aves show following exclusive characteristics.
- Presence of feathers
- Their forelimbs are modified into wings.
- The hind-limbs are adapted for perching, walking or swimming, etc.
- The upper and lower jaws are modified into a beak, which lacks teeth.
- Endoskeleton is fully ossified (bony) and the long bones are hollow with air cavities (pneumatic) to reduce weight.
- Most of the bones are firmly fused together, which help in flight.
- Female has usually well developed single left ovary and oviduct.
Presence of gizzard, direct development and presence of wings are the characters shown by invertebrate animals as well.
Beak
Class Aves show following exclusive characteristics.
- Presence of feathers
- Their forelimbs are modified into wings.
- The hind-limbs are adapted for perching, walking or swimming, etc.
- The upper and lower jaws are modified into a beak, which lacks teeth.
- Endoskeleton is fully ossified (bony) and the long bones are hollow with air cavities (pneumatic) to reduce weight.
- Most of the bones are firmly fused together, which help in flight.
- Female has usually well developed single left ovary and oviduct.
Presence of gizzard, direct development and presence of wings are the characters shown by invertebrate animals as well.
Suggest Corrections
0
Join BYJU'S Learning Program
Explore more
Join BYJU'S Learning Program
