Reproduction

Reproduction

1. Animals Lay eggs-oviparous

   • Incubation -Eggs are kept warm
     • Eggs structure
       • Egg shell- think hard outer layer
         • Albumen- Jelly like white coloured substance
           • Yolk-Yellow substance present inside
             • Embryo- Embryo develops into a young one
               • Life cycle- different stages of life
   • Birds
     • https://www.youtube.com/watch?v=dyZjCw5Rl2Y
   • Fish
     • lay plenty of eggs in water Most are eaten by otherfish, few survive. Eggs get warmth from sun rays
   • Frogs
     • https://www.youtube.com/watch?v=wAcwjWi6I9Y
     • lay large eggs ,in cluster called spawn.
       • Young ones that hatch from the eggs are called tadpoles
         • The process of transformation of a young one into an adult which looks different is called metamorphosis.
   • Butterfly
     • http://natgeotv.com/ca/great-migrations/videos/growing-up-butterfly
     • lay eggs on leaves
       • small worm like larva called caterpillar hatches
         • larva grows in size by eating plants . It forms a prtotective covering called pupa
           • Pupa sheds its old skin many times -moulting
   • Reptiles
     • lay eggs on the ground
       • Sun rays help them to grow into an adult
   • Grasshopper and cockroaches
     • Tiny larva called nymph
       • resemble parents
         • nymph undergoes moulting several times , develops into an adult
           • https://www.youtube.com/watch?v=AvxMnJVCfvo

2. Animals give birth to babies-Mammals

   • Development takes place inside the mother and drink mother's milk
     • Babies have hair on their bodies breathe through lungs
       • Mammals take care of their young ones feed and protect them
   • whales and dolphins are called aquatic mammals

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