Biology

Dental and Oral Biology

967 Questions

Dental and Oral Biology focuses on the structure, development, and function of teeth and oral tissues. It covers key concepts like dental formulas, tooth eruption, and common oral diseases. These topics are essential for medical and biology entrance examinations.

Dental formulaTooth anatomyMilk teethOral diseasesTooth decay

Dental and Oral Biology Questions

Multiple choice

Dental formula of a rabbit is

  1. (2/1), (0/0), (3/2), (3/3)

  2. (2/1), (1/0), (3/2), (3/3)

  3. (2/1), (0/0), (2/2), (3/3)

  4. (1/1), (3/2), (0/0), (3/3)

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Correct Answer: (2/1), (0/0), (3/2), (3/3)

Multiple choice

Pulp cavity of teeth is lined by

  1. odontoblast

  2. chondroblast

  3. osteoblast

  4. amyloblast
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is a cell in the pulp of tooth. It produces dentine.

Multiple choice

Wisdom tooth in human is

  1. 3rd molar and 4 in number

  2. 3rd molar and 2 in number

  3. 2nd molar and 2 in number

  4. 2nd molar and 4 in number
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A wisdom tooth or third molar is one of the three molars per quadrant of the human dentition.

Multiple choice

What is the hardest substance in the human body?

  1. Your head

  2. Fingernails

  3. Your knees

  4. Tooth enamel
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Tooth enamel is the hardest substance in the human body, even harder than bone, due to its high mineral content. Bones and fingernails are significantly softer.

Multiple choice biology digestive system of human buccal cavity digestive system - organs coordination in the process of digestion

Which of the following teeth are absent in a rat?

  1. Canines and molars

  2. Incisors and molars

  3. Incisors and premolars

  4. Canines and premolars
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rats have incisors and molars. Incisors are the foremost teeth in mammals. In rats, there are four, long, sharp front teeth, two on top and two on the bottom. They are specialized for gnawing. Molars are rearmost teeth in the mouth of rat used for grinding food prior to swallowing it. Rats have 12 molars, six on top and six on the bottom. Rats do not have canines (the conical, pointed teeth used for holding prey, defense) or premolars (grinding teeth behind the canines and in front of the molars).
Thus, the correct answer is option D.

Multiple choice biology digestive system of human buccal cavity digestive system - organs coordination in the process of digestion

Premolars are absent in

  1. Rat

  2. Elephant

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Elephants have 26 teeth- 2 incisors (known as tusks), 12 deciduous premolars and 12 molars.
Rats have 8 teeth on the lower jaw and 8 on the upper jaw, a total of sixteen teeth which consists incisor, premolar and molar.
Thus, the correct answer is option D.

Multiple choice biology digestive system of human buccal cavity digestive system - organs coordination in the process of digestion

In Rabbit and Hare, the incisors of upper and lower jaw halves are

  1. 1 / 1

  2. 2 / 1

  3. 2 / 2

  4. 2 / 0
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The incisors and cheek teeth of rabbits are called aradicular hypsodont teeth. This is sometimes referred to as an elodent dentition. These teeth grow or erupt continuously. The growth or eruption is held in balance by dental abrasion from chewing a diet high in fibre. The anatomic dental formula is 2( i2/1 c0/0 m3/2 )= 16  deciduous teeth.


So, the correct option is '2/1'.

Multiple choice biology digestive system of human buccal cavity digestive system - organs coordination in the process of digestion

Dental formula of elephant is

  1. $ \dfrac {1,0,0,3}{0,0,0,3} $
  2. $ \dfrac {1,0,0,3}{1,0,0,3} $
  3. $ \dfrac {1,0,2,3}{1,0,1,3} $
  4. $ \dfrac {2,0,3,3}{1,0,3,3} $
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The dental formula of adult elephants for both species is I 1/0 C 0/0 PM 3/3 M 3/3, with a total number of 26 teeth. The two upper incisors are the tusks.


So, the correct option is 'Option A'.