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. |
1. | I is correct but II is incorrect |
2. | Both I and II are correct. |
3. | Both I and II are incorrect. |
4. | I is incorrect but II is correct. |
1. a four chambered heart | 2. a single aortic arch |
3. homeothermy | 4. mammary glands |
1. Ornithorhynchus | 2. Macropus |
3. Macaca | 4. Balaenoptera |
1. | Flightless bird |
2. | Limbless amphibian |
3. | Viviparous mammal |
4. | Economically important insect |