Page 83 - EM BIOLOGY NOTES 10TH CLASS PSR DIGITAL BOOKS

LAB ACTIVITIES

11. ACTION OF PTYALINE ON STARCH

AIM
To show the action of ptyaline (salivary enzyme) on starch PSR DIGITAL BOOKS
APPARATUS original preparation
1. Test tube 2. Saliva 3. Starch powder lab activity ONLY 10TH CLASS (T.M.) & (E.M.)
pl. scan QR
4. Iodine 5. Paraffin PLEASE SCAN THE QR
DIAGRAM
RAJU’S NATURAL SCIENCE ACADEMY

PROCEDURE
1. Collect saliva into a test tube and filter it.
2. Take 10ml of starch solution into a test tube.
3. Add 2 drops of iodine solution to it.
4. Starch solution changes into blue black colour.
5. Then divide it into 2 parts in two test tubes.
6. Add 5ml of saliva into first part.
7. Do not add anything into the second part.
8. Keep these test tubes in a testtube stand and observe.
OBSERVATION
1. We will not find any colour change in the test tube to which water
is added.
2. We will find the colour change in the test tube to which saliva is
added.
INFERENCE
This experiment shows the action of saliva (Ptyaline) on starch.
PRECAUTIONS
1. Clean your mouth before collecting saliva.
2. Carefully handle the glass waste.

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