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प्रश्न
Answer in detail.
How do fish exchange gases?
उत्तर
Fish exchange gases in water through gills. Gills enable the fish to obtain oxygen dissolved in the water.
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संबंधित प्रश्न
Fill in the blank.
Cnidarians have ................ symmetrical body.
Fill in the blank.
..................... and liver fluke live in the intestines of human beings and cattle.
Select the most appropriate answer.
Milk in the body of mammals is produced by
Fill in the blank.
The animals without a backbone whose body is soft and often covered by a hard shell are .................
State if the following statement is true or false. Correct the statement if it is false.
Insects belong to the amphibian group of animals.
Answer in detail.
Write two characteristics of the reptiles.
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 |
The biggest vertebrate animal is the ______.
Mention two special features of mammals.
Why are eggs of reptiles covered with shells unlike the eggs of amphibians?
