Biology
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.
Answer
(a) The parts are-
- 1 → Enamel
- 2 → Dentine
- 3 → Pulp
- 4 → Gum
- 5 → Crown
- 6 → Cement
(b) The type of teeth shown in the given figure has only one root. Hence it is a canine or incisor that is used to bite or pierce.
(c) The part labelled '3'(Pulp) is a soft connective tissue present in the pulp cavity of the tooth. It consists of blood capillaries, lymph vessels and nerve fibres. From the crown of the tooth, the pulp opens through the pulp cavity at the base of the root.
(d) The type of teeth mentioned in the figure and its function are as follows:
| Type of teeth | Number of teeth | Function |
|---|---|---|
| Incisors | 8 | Used to cut and bite |
| Canines | 4 | Used to tear and hold food |
| Premolars | 8 | Used to grind and crush food |
| Molars | 12 | Used to grind and crush food |
Related Questions
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'?
Complete the following table by filling in the blanks 1 to 8.
Organ Enzyme Food acted upon Final product 1 Pepsin 2 3 Mouth 4 5 Disaccharide 6 7 Maltose 8 Draw a labelled diagram to show the internal structure of a mammalian tooth with two roots.