Q. No.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 reptiles |
| 4. | Bone of forelegs of frogs |
As you can see from the given pie chart, over 70% of Mammalia species come from a single order. Which order of class mammalian is this?
| 1. | Rodentia | 2. | Chiroptera |
| 3. | Carnivora | 4. | Primata |
The following schematic diagram of a part of skeleton can be that of a/an:
| 1. | Amphibian | 2. | Reptile |
| 3. | Bird | 4. | Mammal |
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. |
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
Animals with the type of embryonic development shown in the given diagram are:
1. Holometabolous
2. Paurometabolous
3. Protostomes
4. Dueterostomes
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