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Question

If the teeth are not cleaned regularly, they become covered with a sticky yellowish layer W of food particles and bacteria. Since layer W covers the teeth, the alkaline liquid X secreted by glands Y inside the mouth cannot reach the teeth surface to neutralise the acid formed by the action of organisms Z on sugary food, and hence tooth decay sets in.
(a) What is W known as?
(b) What is (i) X, and (ii) Y?
(c) What are organisms Z?
(d) State one way of removing layer W from the teeth.


Solution

(a) W is the dental plaque.

(b) (i) X refers to the saliva, while (ii) Y refers to the salivary glands.

(c) Organisms Z are bacteria.

(c) Layer of W, i.e. dental plaque, can be removed by regular brushing of teeth.

Science
Lakhmir Biology 2013
Standard X

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