Which of the following is unique to the molluscs and has no equivalent in any other animal?
1. | Haemocoel | 2. | Hemocyanin |
3. | Radula | 4. | Metamerism |
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Consider the two statements:
I: | The development of an AP axis in animals with bilateral symmetry is important in locomotion. |
II: | Bilateral symmetry gives the body an intrinsic direction and allows streamlining to reduce drag. |
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. Only I is correct
4. Both I and II are incorrect
Animals with the type of embryonic development shown in the given diagram are:
1. Holometabolous
2. Paurometabolous
3. Protostomes
4. Dueterostomes
Consider the two statements:
I: | Platyhelminthes are restricted to environments where dehydration is unlikely. |
II: | They are dorso-ventrally flattened. |
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. Only I is correct
4. Both I and II are incorrect
Biradial symmetry is most obvious in:
1. | Cnidarians | 2. | Ctenophores |
3. | Nematodes | 4. | Echinoderms |
Identify the incorrect statement regarding cyclostomes:
1. | Lampreys have direct development, but Hagfishes go through a larval stage followed by metamorphosis into a juvenile form. |
2. | Unlike jawed vertebrates, which have three semicircular canals in each inner ear, lampreys have only two and hagfishes just one. |
3. | The hagfish blood is isotonic with seawater, while lampreys appear to use the same gill-based mechanisms of osmoregulation as marine teleosts. |
4. | Both hagfishes and lampreys have a single gonad. |
The following schematic diagram of a part of skeleton can be that of a/an:
1. | Amphibian | 2. | Reptile |
3. | Bird | 4. | Mammal |
Which of the following reptilian hearts can be that of a crocodile?
1. | 2. | ||
3. | 4. |
The structure marked as ‘S’ in the given diagram helps bony fishes in:
1. Oxygenation of blood
2. Achieving neutral buoyancy
3. Increasing absorptive surface area for food
4. Protection of the nerve cord
The bone structure in the following diagram shows:
1. Adaptation for flight in birds
2. Presence of excess of the hemopoietic tissue in mammals
3. Rudimentary limb bones in some repltiles
4. Bone of forelegs of frogs
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