RECAP THE CONCEPTS

All living things go through a life cycle. A cycle is a pattern that repeats itself.

Living things reproduce to ensure the continuity of their own kind.

Animals with 3-stage life cycle:

Chicken

  • Egg (hard shell) ===>

  • Chick (have wings) ===>

  • Adult Chicken (have wings)

chicken life cycle.JPG

Cockroach

  • Egg (in egg case) ===>

  • Nymph (moults, no wings) ===>

  • Adult Cockroach (have wings)

cockroach life cycle.JPG

Dragonfly

  • Egg (in water) ===> 

  • Nymph (moults, breathes using gills to take in dissolved oxygen from the water) ===> 

  • Adult Dragonfly (no gills, breathes through holes in its body, have wings)

dragonfly life cycle.JPG

Frog

  • Egg (in water) ===>

  • Tadpole (breathes using gills) ===>

  • Adult Frog (lives on land, takes in atmospheric air (oxygen) using lungs and moist skin, also able to take in dissolved oxygen through their moist skin)

frog life cycle.JPG

Animals with 4-stage life cycle:

Butterfly

  • Egg (under a leaf) ===>

  • Larva - Caterpillar (moults to grow bigger) ===>

  • Pupa (does not eat or moult) ===>

     

  • Adult Butterfly

butterfly life cycle.JPG

Mosquito

  • Egg (in stagnant water) ===>

  • Larva (Wriggler) (breathes using a breathing tube to take in atmospheric air (oxygen) above the water surface) ===>

  • Pupa (breathes using breathing tubes) ===> 

  • Adult Mosquito (comes out of the water, with wings)

mosquito life cycle.JPG

Practice: Mastering Keywords

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