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. 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 |