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ICSE Class 9 Biology Question 8 of 12

Digestive System — Question 4

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Question 4

Study the following dental formula and then answer the questions that follow:

i34c00pm01m11i\dfrac{3}{4} \enspace c\dfrac{0}{0} \enspace pm\dfrac{0}{1} \enspace m\dfrac{1}{1}

(a) What is the total number of teeth in the (i) upper jaw and (ii) lower jaw?

(b) State the total number of teeth present in the dentition.

(c) Give the dental formula of an adult human being.

Answer

(a) The total number of teeth in the upper jaw are 8 and lower jaw are 12.

(b) The total number of teeth present in the given dentition are 20 teeth.

(c) The dental formula of an adult is as follows:

Human adult: 2,1,2,32,1,2,3=32\dfrac{2, 1, 2, 3}{2, 1, 2, 3} = 32 (permanent teeth with 4 wisdom teeth added)