Question

Explain Chordates-Class Cyclostome ,Pisces and reptilia in detail -HT

Answer 1

Answer:

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Explanation:

Class Cyclostome

• They have an elongated body bearing 6-15 pairs of gill slits for respiration.
• Cyclostomes have a sucking and circular mouth without jaws and body is devoid of scales and paired fins.
• Cranium and vertebral column are cartilaginous and show closed type of circulation.
• Cyclostomes are marine but migrate for spawning to fresh water, after spawning, within a few days, they die and their larvae, after metamorphosis, return to the ocean.
• Examples: Petromyzon (Lamprey) and Myxine (Hagfish).

Class Pisces

• The main distinguishing feature of Pisces is that these organisms that they posse fins on their body. They have a very elongated body which has 6 – 15 pairs of the gills slits fir the process of respiration.
• They do not have jaws in their mouth so they have a sucking and circular mouth.
• There body is completely covered with the fine scales and very tough in touch as they are aquatic organisms so they also have fins on their body.
• The notochord present in whole life span on their body.
• They live mostly in the marine habitat but can also migrate to the freshwater bodies to lay their eggs, when eggs come in the larval stage they again join the ocean and their further development took place in the ocean.
• The blood circulation system is the closed type and the heart is of two chambers in all the members of this group.
• Petromyzon, hagfish, dogfish are the example of pisces.

Class Reptilia

• These are creeping and burrowing terrestrial animals with scales on their body.
• They are cold-blooded animals found in most of the warmer regions of the world.
• Their skin is dry, and rough, without any glands.
• Few of these shed the scales on their skin as skin cast.
• The respiration takes place with the help of the lungs.
• The skull is monocondylic.
• The heart is 3 chambered. However, crocodiles have a 4-chambered heart.
• The nervous system comprises of 12 pairs of cranial nerves.
• Reptiles are ureotelic, uricotelic, and ammonotelic.
• Fertilization is internal.
• They are oviparous and the eggs are very yolky.
• Eg., Snakes, Turtles, Lizards, Crocodiles

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