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प्रश्न
Answer in detail.
How are the bones of birds different from those of other vertebrates?
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 aquatic animal with scaly skin which breathe with gills
Give two examples of Amphibians:
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 |
Find the odd one out. Give reason.
frog, shark, seahorse, carp
Find the odd one out. Give reason.
snail, oyster, earthworm, octopus
Find the odd one out. Give reason.
snake, alligator, eel, turtle
Write a short answer.
What do you mean by the radially symmetrical body?
Write a short answer.
What is an exoskeleton? How is it different from a backbone?
Given below is an animal followed by three terms or features. Underline the term which does not match with the animal.
Pigeon - Feathers, wings, hair
Why are eggs of reptiles covered with shells unlike the eggs of amphibians?
