Page 404 - General Knowledge

GENERAL KNOWLEDGE 2019

 Cold blooded animals.
 Respiration through gills, skin and lungs.
 Contains three chambered heart.

 Frog, Necturus, toad, salamander are some examples.
Class Reptilia

 They are crawling animals.
 Cold-blooded and have two pair of limbs.
 Skeleton is flexible.
 Respiration takes place by lungs.
 Have 3 ½ chambered heart.
 In crocodile heart, there are four chambers.
 Eggs are covered with shell made up of calcium carbonate.
 Lizard, snake, tortoise, turtle are some examples.
 Cobra, the only snake which makes nests.
 Heloderma, the only poisonous lizard.
Class Aves
 They are aerial vertebrates - birds.
 Warm blooded tetrapod vertebrates with flight adaptation.
 Fore-feet are modified into wings to fly.

 Respiration through lungs.
 Birds have no teeth. Beak helps in feeding.
 Single ovary and pneumatic bones.
 Crow, peacock, parrot are some of the examples.
 Ostrich – Largest bird.
 Humming bird – Smallest bird.
 Largest zoo in India is Alipur (in Kolkatta)
Class Mammalia
 Warm blooded animals.
 Tooth comes twice.
 No nucleus in matured RBC.

 Skin of mammals contains hair.
 External ear is present.
 Divided in to three sub classes :
 Protheria – Lays eggs. E.g. Echidna.
 Metatheria- Bears the immature child. e.g. Kangaroo.
 Eutheria- Bears well developed child. E.g. Humans.
 Give birth to young ones, but Echidna and Platypus are egg laying mammals.

5. SYSTEM OF HUMAN BODY AND DISEASES
Integumentary System
 Human skin is composed of a minimum of three layers.
 They are epidermis, dermis and hypodermis.
Epidermis
 Top layer of the skin is made up of epithelial cells.

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