Question

In Rabbit and Hare, the incisors of upper and lower jaw halves are
A) 1/1
B) 2/1
C) 2/2
D) 2/0

Answer 1

Hint:The four front teeths in the upper and lower jaws are called incisors. The function of the incisors is to cut the food into pieces. Incisors have a single root and a sharp incisal edge.

Complete answer:
Rabbits and hares belong to the family Leporidae.They are the small to moderately sized animals who are adapted for rapid movement.These animals have long hind legs with four toes on each foot and shorter fore legs with five toes in each.Both rabbits and hares are herbivores (only eat plant parts and plant products).

Incisors of Rabbit and Hare:
All teeth in the rabbits and frogs are particular hypsodont.This is sometimes also called as an adolescent dentition.The teeth grow or erupt continuously.Rabbits and hare have four incisor teeths in the upper jaw.Rabbits have an interesting arrangement of their upper incisors in that the second incisor is present behind the first incisor.The second incisor is called the peg tooth.

Dental formula of rabbit and Hare:
$2\times({ I \,2/1 : C\, 0/0 : P\, 3/2 : M \,3/3 })$
The dental formula tells that in rabbit and hare
>The incisors are 2/1
>Canines are 0/0
>Premolars are 3/2
>Molars are 3/3
Therefore, it has been clear from the above discussion that in rabbit and hare, the incisors of upper and lower jaw halves are 2/1.

Hence, option B is the correct option for this question.

Note:Teeth are the hardest substances present in the body of the human. The hardest white outer part of the teeth is called enamel. Enamel is made up of calcium phosphate. A layer that underlines the enamel is called dentin. The softer living inner structure of teeth is called pulp. A layer of connective tissue which binds the roots of teeth to the gums and jawbone is called cementum.