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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
Tick (✓) the appropriate answer:
Identify the animal which is not an Arthropoda
Write one difference between the following pair:
Platyheminthes and Nematoda
Fill in the blank.
Some .....................have two pairs of legs per segment.
Fill in the blank.
A ................. has an external coiled shell.
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 |
Differentiate between
warm-blooded and cold-blooded animals.
In mammals, the testis is enclosed by ______.
Why is the crocodile unique among reptiles?
Write a note on mammals.
How are the reproductive characteristics of mammals different from those of aves?
