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प्रश्न
Answer in detail.
How are the bones of birds different from those of other vertebrates?
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उत्तर
The bones of the birds are hollow and filled with large air cavities. This makes their skeleton light and enables them to fly. On the other hand, bones of other vertebrates are dense and solid and form a heavy skeleton.
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संबंधित प्रश्न
Give two examples of Reptiles:
Write one difference between the following pair:
Porifera and Coelenterata.
Fill in the blank.
...................... live in the digestive tract of many vertebrates including human beings.
Fill in the blank.
................. have three pairs of jointed legs.
Fill in the blank.
................. is an example of a crustacean.
Fill in the blank.
The backbone of vertebrates is made up of a number of small bones called .....................
Write a short answer.
How are the bones of birds different from those of other vertebrates?
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 |
Which group of animals have following characteristics: Body soft, covered by mantle and a calcareous shell.
On the basis of characteristics given below, name the phyla: Unicellular, microscopic animals.
