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प्रश्न
Describe the important characters of mammals.
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उत्तर
(i) Mammals are warm-blooded vertebrates. Their body is divisible into head, trunk, neck and tail. Movable eyelids are present.
(ii) Females have mammary glands that secrete milk for the nourishment of the young.
(iii) A muscular diaphragm separates thoracic and abdominal cavities.
(iv) Respiration is through lungs only and the heart is four-chambered. Mammals possess non-nucleated biconcave red blood corpuscles.
(v) Fertilisation is internal, and mammals are known to be viviparous.
(vi) Two pairs of pentadactyl limbs are present. Teeth are thecodont and heterodont. Fleshy external ear (pinnae) is present.
(vii) Hair and subcutaneous fat forms an insulating layer. Cutaneous glands such as sweat glands, scent glands and sebaceous glands are present.
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संबंधित प्रश्न
Match the animals given under column A with their respective classification group given under column B
| Column A | Column B | ||
| 1 | Sponge | a | Amphibia |
| 2 | Snail | b | Reptilia |
| 3 | Butterfly | c | Echinodermata |
| 4 | Toad | d | Mollusca |
| 5 | Lizard | e | Arthropoda |
| 6 | Starfish | f | Porifera |
Write down four main characters of Platyhelminthes.
Write down four main characters of Annelida.
Write down four general characters of phylum Echinodermata.
Name the phylum in which ambulacral system is present. What is its function?
Write down four characters of Chondrichtyes.
Give an example of Urochordata.
Distinguish between Nonchordata and Chordata.
Explain the general charaters of phylum Mollusca.
Name major phyla of Animal kingdom. Write down one character and one example of each of them.
What are the group names of the following categories of animals?
Animals with three pairs of legs ___________
What are the group names of the following categories of animals?
Animals with feathers _________
Name three animals (belonging to different classes) which breathe by means of lungs but have no external ears (pinnae).
Write name of any poikilothermic animal.
Fill in the blanks:
Bath sponge belongs to phylum ______.
Choose the correct answer: Mosquito is included in insects because
Choose the correct answer: The animal of class pisces is
Assertion: Binomial name is the universal name and contains two names.
Reason: It was first introduced by Carolus Linnaeus
Assertion (A): All vertebrates are chordates but all chordates are not vertebrate.
Reason (R): The members of subphylum vertebrata possess notochord, during the embryonic period, the notochord is replaced by a cartilaginous or bony vertebral column in adults.
In the light of the above statements, choose the correct answer from the options given below:
Consider the following statements:
- Annelids are true coelomates
- Poriferans are pseudocoelomates
- Aschelminthes are acoelomates
- Platyhelminthes are pseudocoelomates
Choose the correct answer from the options given below:
