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. |
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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. |
I: | Most sponges work rather like chimneys: they take in water at the bottom and eject it from the osculum ("little mouth") at the top. |
II: | The inner surface is covered with choanocytes where the wave-like motion of the whip-like flagella drives water through the sponge's body. |