Page 4 - 3. LESSON NOTES(CH-2-PH IN EVERYDAY LIFE)

This acid decreases the pH value of mouth from 6.
This acid starts decaying the enamel of tooth.
After degradation of enamel teeth becomes sensitive and bad breadth starts
coming out of the mouth.
If decaying of tooth is not stopped timely, it is resulting in tooth loss.

• The action of bacteria can be prevented by brushing of teeth
using toothpaste as it is basic in nature and neutralizes the excess acid produced
in the mouth because of bacteria.

5- Self defense by animal and plants through chemical warfare:
• All living organism got self defence tools as a gift from nature.
For example deer, buffalo, cows, etc. has long and sharp horn,
lizard can change its colour, bee has sting, etc.

• Defense weapon of bee:
Honey bees are armed with chemical sting as defense tool. Honey bee contains
acid in their sting. When a person is stung by honey bee, it injects acid and
pushes and leaves its sting in skin. Because of acid present in sting, victim feels
pain near the stung area. Area of stung get swollen after some time.

Honey bee sting contains methonic acid, so rubbing of baking soda,
toothpaste or other mild base at the stung area neutralizes the effect of acid
and gives relief to the victim from pain.

A Bee stinging Bee sting left behind after stinging

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