Advertisements
Advertisements
प्रश्न
When a person eats sugary food, then organisms A present in his mouth act on sugar to produce a substance B. The substance B first dissolves the calcium salts from the top part C of the tooth and then from its middle part D forming holes E. These holes ultimately reach the part F in the lower part of tooth which contains nerves and blood vessels. The substance B irritates the nerve endings inside the tooth causing toothache.
(a) What are (i) organisms A, and (ii) substance B?
(b) What are (i) part C, and (ii) part D, of tooth known as?
(c) By what name are the holes E in the tooth known?
(d) Name the part F of the tooth.
(e) What will happen if organisms A reach part F of the tooth known?
उत्तर
(a) (i) Organism A is bacteria and (ii) substance B is acid.
(b) (i) Part C is the tooth enamel and (ii) part D is the dentine of the tooth.
(c) The small holes, E, are known as cavities.
(d) F is the pulp of the tooth.
(e) When bacteria (organism A) reaches the pulp (part F) of the tooth, it irritates the nerve endings and causes toothache.
APPEARS IN
संबंधित प्रश्न
What is the role of the acid in our stomach?
What will happen if mucus is not secreted by the gastric glands?
Mention two ways in which the ileum of the mammal is adapted for the absorption of digested food.
Define the following terms :
Peristalsis
Answer in detail.
You had eaten bread in the morning. Starting from the mouth, explain how it is digested?
Throughout the length of the alimentary canal the layer which shows the presence of goblet cells is ______
The process of digestion is completed by:
______ is a major organ for the digestion of food materials.
List the glands associated with digestion.
Digestion of food starts in ______ and gets completed in ______.
