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 neutralize 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.

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 neutralize 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.

MyClass24 · Accepted Answer

W is the dental
(i) X refers to the saliva, while (ii) Y refers to the salivary


Organisms Z are


Layer of W, dental plaque, can be removed by regular brushing of