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.
BiologyClass 10ICSEAnswered 27 Mar 2026
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
Suggested Q&A
Biology · Class 10- BiologyClass 10Explain gene therapy using adenovector
- BiologyClass 10Explain human insulin production using recombinant DNA technology
- BiologyClass 10Explain the epiglottis and surrounding throat structures
- BiologyClass 10Explain the human digestive system shown in the image in simple short points.
- BiologyClass 10Explain the buccal cavity of man shown in the image in simple short points
- BiologyClass 10Explain the large intestine and its various parts