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प्रश्न
Answer in detail.
Name the four types of teeth and their functions
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उत्तर
The four types of teeth are:
Incisors: These are situated at the front and are flat and straight with sharp edges. Which are used for biting and cutting the food.
Canines: These are situated one on either side of the incisors in each jaw. There are two canines in each jaw. These are sharp and pointed and are used for holding and tearing the food.
Premolars: There are 4 premolars in each jaw, situated next to the canines. Each premolar has one or two roots and two cusps. These are used for crushing and grinding the food.
Molars: These are 6 molars in each jaw. The molars have more than one root. These are used for crushing and grinding the food. The last molar of each side in each jaw is also called wisdom tooth because it appears last generally at the age of 17-20 years. The ingested food is first broken down in the mouth when we chew it with our teeth. This process is called mastication or mechanical digestion. It prepares the food for chemical digestion that is, digestion by the action of enzymes.
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| Across | Down | ||
| 1. | Cream-coloured digestive gland | 2. | Feeds with the help of pseudopodia |
| 3. | Undigested excretory solid residues | 6. | Total number of molars in one jaw of an adult |
| 4. | Organ that mixes saliva with the food | 8. | Largest gland |
| 5. | Point of defecation | 9. | Watery secretion in the mouth |
| 7. | Stored in gall bladder | 11. | A ruminant |
| 10. | Finger-like outgrowth in the small intestine | 12. | Form of food chewed by ruminants |
| 13. | Kind of taste buds | ||
| 14. | Kills bacteria in the stomach | ||
