Advertisements
Advertisements
प्रश्न
Write a short answer.
What is an exoskeleton? How is it different from a backbone?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Fill in the blank.
Some .....................have two pairs of legs per segment.
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 |
Answer in detail.
How will you classify animals according to the food they eat?
Answer in detail.
You are asked to classify an animal in the correct group. The animal has a soft body and arm-like tentacles. You dissect the animal and find that it has an internal shell. Is the animal a cnidarian or a mollusc? Explain your answer.
Classify the given animals into different categories indicated.
Jellyfish, liver fluke, pinworm, Ascaris, tapeworm, Hydra, sea anemone into cnidarians, Platyhelminthes, and Nemathelminthes.
Mention any one major similarity and one major difference in the following pairs of an animal:
Bat and Pigeon
Write important characters of chordates?
On the basis of characteristics given below, name the phyla: Unicellular, microscopic animals.
The notochord extends throughout the entire length of the body is ______.
Assertion (A): Mammals give birth to their young ones.
Reason (R): Platypus is an egg-laying mammal.
