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प्रश्न
Given below are groups of animals, and their characteristics features. Some of the features are incorrect. Identify the odd one out in each.
| Group | Characteristic features | Odd one out |
| Porifera | porous animals, have tentacles, fixed to surface | |
| Amphibia | cold-blooded, lungs in adults, scaly skin | |
| Aves | cold-blooded, wings, feathers, bones with large air spaces | |
| Pisces | live in water, scaly skin warm-blooded, fins for swimming |
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उत्तर
| Group | Characteristic features | odd one out |
| Porifera | porous animals, have tentacles, fixed to surface | have tentacles |
| Amphibia | cold-blooded, lungs in adults, scaly skin | scaly skin |
| Aves | cold-blooded, wings, feathers, bones with large air spaces | cold-blooded |
| Pisces | live in water, scaly skin, warm-blooded, fins for swimming | warm-blooded |
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संबंधित प्रश्न
Write one difference between the following pair:
Platyheminthes and Nematoda
Fill in the blank.
Fishes obtain oxygen from water through ......................
Match the following.
| Group | Characteristics | ||
| 1. | Molluscs | a. | Feed milk to young ones, warm-blooded |
| 2. | Spongers | b. | bag-like body with tentacles around the opening |
| 3. | Flatworms | c. | fins, gills and cold-blooded |
| 4. | mammals | d. | body with large opening and many small pores all over |
| 5. | Fish | e. | jointed legs, exoskeleton |
| 6. | cnidarians | f. | have only one opening |
| 7. | arthropods | g. | hard shell, soft body |
| h. | cylindrical, unsegmented body with mouth at one end and anus at the posterior end |
Answer in detail.
Name the different classes of arthropods. Write one characteristic feature of each class.
Answer in detail.
How do fish exchange gases?
Answer in detail.
You are asked to classify an animal in the correct group. The animal has a soft body and arm-like tentacles. You dissect the animal and find that it has an internal shell. Is the animal a cnidarian or a mollusc? Explain your answer.
Give reason for the following.
What happens to the body temperature of a fish when the temperature of water drops?
Name the various classes of chordates with two examples.
In mammals, the testis is enclosed by ______.
Why is the crocodile unique among reptiles?
