Question

7. Which of these statements is true about the
permanent set of teeth of humans?
(i) It contains 32 teeth, 16 in each jaw.
(ii) There are 4 incisors in each jaw.
(iii) There are 4 canines in each jaw,
(iv) There are 4 molars in each jaw.
a) (i) and (ii)
b) (i) and (iii)
d) (i) and (iv)
c) (iii) and (iv)​

Answer 1

Answer

b) (i) and (iii)

$\rule{200}2$

Explanation

There are total 32 permanent teeth in the human beings. Both jaw i.e. upper jaw and lower jaw contains 16 teeth (32/2). There are total 20 milk teeth or temporary teeth in the child. Upper jaw contains 10 teeth and lower jaw contains 10 teeth (20/2).

There are 4 types of teeth in the oral cavity:

Incisors, Canines, Molars and Pre-molars.

• 4 incisors in upper jaw and 4 in lower jaw. Therefore, there are total 8 incisors.
• 2 canines in upper jaw and 2 in lower jaw. Total 4 canines.
• There are 12 molars teeth out of which 4 are considered as wisdom teeth.
• Similarly, there are total 8 premolars teeth 4 in upper and 4 in lower jaw.

From above we can say that; permanent set of teeth of humans contains 32 teeth, 16 in each jaw and 4 canines in each jaw.

Answer 2

answer:

is ii and iii it b