Question

Q1. describe parts of tooth with help of diagram.
Q2. what is meant by dental carries?how are they caused?
Q3. what happens to a plant when placed in dark for 3 days?
Q4. what is role of KOH in any area of its present?
Q5. why part of leaf covered with black paper does not chnage blue black in iodine
solution?
Q6. the breathing cycle is rythemic where as exchange of gases is a continuous
process.justify
Q7. what happens if onducting tubes of circulatory system develop a leak?state in brief
how could this leak be avoided?

Answer 1

Bacteria and food can cause tooth decay. A clear, sticky substance called plaque is always forming on your teeth and gums. Plaque contains bacteria that feed on the sugars in the food you eat.

As the bacteria feed, they make acids. The acids attack the teeth for 20 minutes or more after you eat. Over time, these acids destroy tooth enamel, causing tooth decay.

ok