In birds:
a: | the characteristic feature is the presence of feathers. |
b: | forelimbs are modified into wings. |
c: | flight is present in all members. |
d: | hind limbs do not have scales. |
1. Only (a) and (d) are incorrect
2. Only (c) and (d) are correct
3. (a), (b) and (c) are correct
4. Only (a) and (b) are correct
Birds are not characterized by:
1. a fully ossified endoskeleton
2. pneumatic long bones
3. absence of crop and gizzard in the digestive tract
4. a dry skin without glands except the oil gland
Consider the given two statements:
I: | Birds have a four chambered heart and are warm blooded. |
II: | Respiration in birds is by lungs that are connected to air sacs. |
I: | The digestive tract of birds has additional chambers, the crop and gizzard. |
II: | Air sacs connected to lungs supplement respiration. |
III: | They possess beak with teeth. |
1. | Only I and II are correct | 2. | Only I and III are correct |
3. | Only II and III are correct | 4. | I, II and III are correct |
I: | They have feathers and most of them can fly. |
II: | They possess beak. |
III: | They have scales on the forelimbs and hindlimbs are modified into wings. |
IV: | They have dry skin without glands except the oil gland at the base of the tail. |
V: | They possess a fully ossified (bony) endoskeleton. |
VI: | They have long bones that are solid without air cavities (pneumatic). |
1. | 3 | 2. | 4 |
3. | 5 | 4. | 6 |
Biological name | Common name | |
1. | Aptenodytes | Penguin |
2. | Pavo | Peacock |
3. | Struthio | Pigeon |
4. | Psittacula | Parrot |
1. a four chambered heart | 2. a single aortic arch |
3. homeothermy | 4. mammary glands |
I: | The most unique characteristic is the presence of mammary glands. |
II: | Skin is unique in possessing hair. |
III: | Heart is unique in being four-chambered. |
IV: | Viviparity is a unique feature. |