Biology
The figures (A, B, C and D) shown below represent different kinds of teeth in humans. Study the figures and answer the following questions:
(a) What kind of teeth do A, B, C and D represent ?
(b) Write one structural feature/shape of each.
(c) Mention the number of teeth of each kind in one jaw with their specific position.
(d) Name two minerals present in teeth.
(e) What do you mean by 'Wisdom tooth'?
Answer
(a)
- A → Incisor
- B → Canine
- C → Premolar
- D → Molar
(b)
- A → Broad and sharp
- B → Conical and sharply pointed
- C → Two hill-like projections(bicuspid)
- D → Large grinding surface
(c)
- A → Four, centre of each jaw
- B → Two, one on each side of incisor
- C → Four, two on side of each canine
- D → Six, three on each side
(d) Calcium and phosphorous.
(e) Last molar on each side of jaw is called wisdom teeth.
Related Questions
Draw a neat diagram of the "Microscopic Structure of an intestinal villus" and label the parts given below :
- Epithelium
- Capillaries
- Lacteals
Answer the following questions :
(a) What is the advantage of having a large number of villi on the inner surface of small intestine ?
(b) Write the important role of lacteals.
(c) Name the juice secreted from the glandular cells of small intestine.
(d) Name the specific secretions of:
- Salivary gland
- Stomach
- Liver
- Pancreas
Study the diagram given below and then answer the questions that follow:
(a) Name the parts labeled 1, 2, 3, 4, 5 and 6.
(b) Identify the tooth and give a reason to support your answer.
(c) Describe the structure of the part labeled '3'.
(d) Give the total number of the type of tooth mentioned in '1' above, in the mouth of an adult and state its function.