Study the diagram given below and then answer the questions that follow :

(a) Name the parts labelled 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 labelled '3'.

(d) Give the total number of the type of tooth mentioned in 'l' above, in the mouth of an adult and state its function.

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Solution

(a)
1 → Enamel
2 → Dentine
3 → Pulp
4 → Gum
5 → Crown
6 → Cement

(b) The tooth shown in the diagram has only one root, so it is an incisor or canine which is used for biting and piercing.

(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. These extend from the crown of the tooth and open through the pulp cavity at the base of the root.

(d) Type of teeth in the mouth of an adult:

Incisors (8) → Used for biting and cutting

Canines (4) → Used for holding and tearing of food

Premolars (8) → Used for grinding and crushing of food

Molars (12)→ Used for grinding and crushing of food

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Teeth

Standard IX Biology

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