Which part of the tooth, made up of a crystalline form of calcium phosphate, is the hardest substance in the body?

Root

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Body

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Enamel

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All

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Solution

The correct option is C Enamel
The enamel on the teeth is the hardest and highly mineralized substance in the body. It covers the outer layer of each tooth and is the most visible part of the tooth. Enamel is made up of hydroxyapatite which is crystalline calcium phosphate.

Hence, the correct answer is option (C).

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Similar questions

Q. Calcium phosphate is present in tooth enamel, its nature is:

Q. Calcium phosphate is present in tooth enamel. Its nature is __________.

Q.
Which one of the following is the hardest part of a tooth?

Name the following :

(a) The hardest naturally occurring substance.

(b) A greyish black non-metal that is a good conductor of electricity.

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 (rum 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.

(a) What are (i) organisms A, and (ii) substance B?
(b) What are (i) part C, and (ii) part D, of tooth known as?
(c) By what name are the holes E in the tooth known?
(d) Name the part F of the tooth.
(e) What will happen if organisms A reach part F of the tooth?

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