Question

Incisors present in which bone of the human jaw?
A. Premaxilla
B. Maxilla
C. Palatine
D. None

Answer 1

Hint:-Thecodont dentition is widespread in mammals. In this state, the tooth is placed in the bone cavity or the alveoli of the jaw, and the capillaries and nerves enter the pulp cavity through the open end of the root cavity. The premaxilla belong to a pair of small cranial bones at the upper ends of many animals that usually have teeth.

Complete Answer:-Heterodont dentition is a common trait of mammals, which means teeth vary in shape, size, and function. Their functions also differ in different parts of the tooth.
In humans four type of different teeth are found these are:
A. Incisors -These teeth are located anteriorly in the premaxilla of the upper jaw and on the denataries tips in the lower jaw .They are tapered, strong and durable. Used for cutting or cutting. The front teeth(incisors) can be completely absent in sloths or absent on the upper jaw of sheep and cattle. In rodents and lagomorphs, the front teeth are chisel-shaped, open rooted and continuously grow throughout life.
B. The Canine teeth are just behind the front teeth. They are individual in each half of the jaw. They have large tips and long-rooted tubules. They are used to pierce and tear the flesh of prey . Sometimes dogs are used as prey, especially in carnivorous mammals.
C. Premolars have two cusps and two roots and they are used for grinding food material.
molars are located behind the premolar. They have more than one root and many ends. The molars are used to cut food.

Hence the correct option is (A) premaxilla.

Note:- Cheese teeth: Premolars and molars together called cheese teeth,.
Dentition: The arrangement of teeth on the lower and upper jaw especially on maxilla, premaxilla and on dentary bones is called dentition.
Most mammals have two pairs of teeth. The first temporary teeth set also known as deciduous teeth
has been replaced by a second teeth set called a permanent tooth. In bats and guinea pigs, milk teeth disappear before birth. Molars are missing on milk teeth.
Modern birds and turtles have no teeth. All mammals have teeth, but some have a secondary toothless condition. The adult platypus (Ornithorhynchus) has epidermal teeth, but no natural teeth. In the platypus, the teeth of the adult embryo are replaced by keratinous epidermal teeth.