Biology

Dental and Oral Biology

924 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

Directions: Read the following information and answer the given question.

Sneha and Samiksha are siblings. Sneha brushes her teeth twice a day whereas Samiksha hardly brushes once in a day. Sneha suggests her sister to do the same but she doesn’t bother, due to which she is suffering from various oral health problems.

Which of the following is the most common oral health issue caused due to reduced frequency of brushing?

  1. Dental caries

  2. Dental trauma

  3. Decreased saliva production

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

Poor oral hygiene, specifically infrequent brushing, allows plaque to build up, which leads to the demineralization of tooth enamel, resulting in dental caries (cavities).

Multiple choice

Directions: Read the following information and answer the given question.

Sneha and Samiksha are siblings. Sneha brushes her teeth twice a day whereas Samiksha hardly brushes once in a day. Sneha suggests her sister to do the same but she doesn’t bother, due to which she is suffering from various oral health problems.

Which of the following is a correct definition of dental decay?

  1. Gradual softening of enamel only

  2. Gradual softening of dentin only

  3. Gradual softening of enamel and dentin

  4. Gradual softening of pulp only
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Dental decay is the process where bacteria produce acids that gradually soften and destroy both the outer enamel and the underlying dentin of the tooth.

Multiple choice

Milk teeth in a child do not include ________.

  1. Incisors

  2. Canines

  3. Molars

  4. Premolars
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The primary (milk) dentition in children consists of incisors, canines, and molars. Premolars are only present in the permanent adult dentition.

Multiple choice

How are the leaf teeth of maple leaves?

  1. Doubly toothed

  2. Saw-toothed, single

  3. Coarsely toothed and probably difficult to distinguish from lobed

  4. Spiny serrate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Maple leaf is coarsely-toothed and probably difficult to distinguish from lobed.

Multiple choice

Match the following:

 
Type of teeth
Function
a. Incisors 1. Biting food
b. Canines 2. Grinding and crushing food
c. Premolars 3. Tearing food

  1. a – 2, b – 3, c – 1

  2. a – 1, b – 3, c – 2

  3. a – 3, b – 1, c – 2

  4. a – 3, b – 2, c – 1

  5. a – 1, b – 2, c – 3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. Incisors are a narrow-edged tooth at the front of the mouth that are used for biting food. Canines are pointed teeth between the incisors and premolars and are used for tearing food. Premolars are the teeth situated inbetween the canine and the molar teeth and are used for grinding and crushing food.

Multiple choice

The substance present in dental plaques or patches is

  1. dextrans

  2. glycogen

  3. inulin

  4. cellulose

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

They  are also a class of storage homo-poly-saccharides of branched linear chains of D-glucose, but the sub units in these are linked by a, 1-6 instead of a, 1-4 glycosidic bonds. They are secreted as sugary slimes by yeast and certain bacteria. Bacteria growing on surfaces of our teeth produce dextran which becomes important component of dental plaques or patches.

Multiple choice

Which jaw bone helps in feeding?

  1. Hyoid

  2. Mandible

  3. Parietal bone

  4. Zygomatic bone
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mandibles together with maxillae constitute jaw bones and help in feeding.

Multiple choice

The structure performing mastication is the _____.

  1. tongue

  2. teeth

  3. esophagus

  4. pharynx
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mastication or chewing is the process, by which food is crushed and ground, by the teeth. It is the first step of digestion, and it increases the surface area of foods, to allow more efficient break down, by enzymes. During the mastication process, the food is positioned between the teeth for grinding, by the cheek and tongue.

Multiple choice

Mastication is a part of ______.

  1. excretion

  2. procreation

  3. digestion

  4. cellular respiration
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mastication or chewing is the process by which, food is crushed and ground by teeth. It is the first step of digestion and it increases the surface area of foods, to allow more efficient break down, by enzymes. During the mastication process, the food is positioned between the teeth for grinding, by the cheek and tongue.

Multiple choice

The number of deciduous teeth in man is

  1. 32

  2. 20

  3. 8

  4. 12
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The milk or deciduous or temporary teeth are 20 in numbers; 10 each in the upper jaw and in the lower jaw. The milk teeth begin to erupt when the child is about 6 months old and should all be present by the end of 24 months.