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प्रश्न
Write a short answer.
What is an exoskeleton? How is it different from a backbone?
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उत्तर
The exoskeleton is a tough outer covering of an animal body. e.g. Crab, lobster have exoskeletons.
Exoskeleton
- It is a rigid external covering of the body that provides support and protection to the body.
- It is present in invertebrates.
- Examples: Crab, lobster, spiders, scorpions, etc.
- It is in the form of a shell, or scales or feathers, etc.
Backbone
- It is an internal skeleton (endoskeleton) that provides support and protection to the body.
- It is a present invertebrate.
- Examples: Humans, fish lions, dogs, etc.
- It is made up of a number of vertebral joined to form a vertebral column.
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संबंधित प्रश्न
Give two examples of Coelenterates:
Name one example of the animal which shows the following characteristics:
Can live in water as well as on land:
Write one difference between the following pair:
Arthropoda and Mollusca
Fill in the blank.
Invertebrates with jointed legs belong to ....................
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 |
State if the following statement is true or false. Correct the statement if it is false.
Insects belong to the amphibian group of animals.
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
Write zoological names of roundworm.
Name the phyla to which following animal belongs: Hydra
Name the phyla to which following animal belongs: Scorpion
