✦ New Age Learning 🔍
Home › Library › Science Lab - Basic 2 › Experiment 13 — Digestion Begins in Your Mouth

🧪 Lab 14 of 15 · Science Lab - Basic 2 · Class 6–7

Experiment 13 — Digestion Begins in Your Mouth

Try it in the interactive lab🔊 Audio

Topic: Biology · Classes 6–7 · Nutrition in animals: the action of saliva

Aim: Make the starch disappear from the bread, so that iodine no longer turns it blue-black.

Daily: Chew a plain roti slowly and it starts tasting faintly sweet. That is this experiment happening on your tongue — saliva breaking starch into sugar before the food even reaches your stomach.

Question: Why does a plain roti taste slightly sweet if you chew it for a long time?

Exp: Salivary amylase converts starch into a simple sugar you can taste.

Question: The enzyme in saliva acts on…

Exp: Salivary amylase breaks starch into sugar.

Question: Enzymes work best at about…

Exp: Human enzymes are tuned to body temperature.

Question: Why does chewing help digestion?

Exp: More surface area means faster enzyme action.

Question: Most absorption of digested food happens in the…

Exp: Its inner lining has villi that absorb nutrients.

All activities in Science Lab - Basic 2

  1. Part 3 — Biology
  2. Experiment 1 — Measure an Odd-Shaped Stone
  3. Experiment 2 — How Fast Is the Trolley?
  4. Experiment 3 — The One-Second Pendulum
  5. Experiment 4 — Hit the Target with Light
  6. Experiment 5 — Which Spoon Gets Hot First?
  7. Experiment 6 — Build an Electromagnet
  8. Experiment 7 — Acid, Base or Neutral?
  9. Experiment 8 — Physical or Chemical Change?
  10. Experiment 9 — Stop the Rust
  11. Experiment 10 — Choose the Right Technique
  12. Experiment 11 — Does a Leaf Need Light to Make Food?
  13. Experiment 12 — What Is in the Air You Breathe Out?
  14. Experiment 13 — Digestion Begins in Your Mouth
  15. Experiment 14 — Design an Animal That Survives

Practise for Class 6–7