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Life Processes in Animals

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You eat two idlis. Where do they go next?

Food in. Air in. Blood carries both. Waste leaves.

This is Chapter 9, Life Processes in Animals, in your NCERT book. Life processes are the jobs every living body does.

What you will learn

  • Digestion, absorption and egestion of food.
  • The path food takes, stop by stop.
  • How saliva changes starch.
  • How a cow and a hen break down food.
  • Why breathing and respiration are different.
  • Lungs, gills and moist skin.
  • How blood carries food and oxygen.
  • What leaves the body.
  • The path of air, from the nostrils to the alveoli.
  • How the ribs and the diaphragm move.
  • How oxygen and carbon dioxide swap at the alveoli.
  • How villi help the small intestine absorb food.

The liver and pancreas add digestive juices. How they help to digest food is not taught here.

There are two checkpoints. Try each one as many times as you like.

Stay safe

Every number in every lab is made up. A teacher does the iodine test. Nothing here asks you to taste anything.

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This track

  1. 0 Start here
  2. 1 Digestion, absorption and egestion
  3. 2 One path, and a job at every stop
  4. 3 Saliva and starch
  5. 4 Ruminants and birds
  6. 5 Checkpoint: what a body does with food
  7. 6 Breathing is not respiration
  8. 7 Lungs, gills and moist skin
  9. 8 Getting food and oxygen around
  10. 9 What a body cannot use has to leave
  11. 10 The path of air
  12. 11 How the chest moves
  13. 12 Gases swap at the alveoli
  14. 13 Villi give food a way in
  15. 14 Checkpoint: the breathing path, the chest and villi
  16. 15 The big picture
  17. 16 Track quiz

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