Q. No.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
2. Only (c) and (d) are correct
3. (a), (b) and (c) are correct
4. Only (a) and (b) are correct
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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
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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. |
2. Both I and II are correct.
3. Both I and II are incorrect.
4. I is incorrect but II is correct.
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| Biological name | Common name | |
| 1. | Aptenodytes | Penguin |
| 2. | Pavo | Peacock |
| 3. | Struthio | Pigeon |
| 4. | Psittacula | Parrot |
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| 1. a four chambered heart | 2. a single aortic arch |
| 3. homeothermy | 4. mammary glands |
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| 1. Ornithorhynchus | 2. Macropus |
| 3. Macaca | 4. Balaenoptera |
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| 1. | Flightless bird | 2. | Limbless amphibian |
| 3. | Viviparous mammal | 4. | Economically important insect |
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| I: | This is seen in sponges, cnidarians, ctenophores and larval echinoderms. |
| II: | This type of body symmetry is generally seen in animals which move actively in their environment. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
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| 1. | Body will be bilaterally symmetrical |
| 2. | Muscle will be well developed |
| 3. | A true coelom will be present |
| 4. | Both will have cells organized into tissues and heterotrophic nutrition |
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| I: | This type of life cycle is called as metagenesis and it is a sort of alternation of generation. |
| II: | Polyps in the life cycle of cnidarians are haploid and medusae are diploid. |
2. Both I and II are correct but II does not explain I
3. I is correct and II is incorrect
4. I is incorrect and II is correct
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