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Question
What is dental plaque?
Short/Brief Note
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Solution
Dental plaque is a sticky, colourless or pale yellow film that constantly forms on your teeth. It is a mixture of naturally occurring mouth bacteria, saliva, and tiny food particles.
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Chapter 1: Life Processes - Exercise 1 [Page 36]
RELATED QUESTIONS
The length of small intestine in a human adult is about ______.
The process of digestion in humans is completed in ______.
| When a person eats sugary food, then organisms A present in his mouth act on sugar to produce a substance B. The substance B first dissolves the calcium salts from the top part C of the tooth and then from its middle part D forming holes E. These holes ultimately reach the part F in the lower part of tooth which contains nerves and blood vessels. The substance B irritates the nerve endings inside the tooth causing toothache. |
- What are (i) organisms A, and (ii) substance B?
- What are (i) part C, and (ii) part D, of tooth known as?
- By what name are the holes E in the tooth known?
- Name the part F of the tooth.
- What will happen if organisms A reach part F of the tooth known?
Draw a well-labelled diagram of the ‘Liver’.
The question has four options. Choose the correct answer:
Parotid salivary glands occur
The process of digestion starts from the ______.
Circle the odd one.
Identify the salivary gland lying below the tongue.
The exit of unabsorbed food material is regulated by ____________.
In which of the following groups of organisms, food material is broken down outside the body and absorbed?
