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

Read the following statements and select the correct option.


Statement 1 : Dental formula gives the number of teeth in the half of each jaw.
Statement 2 : Dental formula can be expressed for insectivorous mammals as well as for the non-mammalian vertebrates. 

  1. Both statements 1 and 2 are correct.

  2. Statement 1 is correct but statement 2 is incorrect.

  3. Statement 1 is incorrect but statement 2 is correct.

  4. Both statements 1 and 2 are incorrect.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Statement 1 is correct as the dental formula represents half of each jaw. Statement 2 is incorrect because dental formulas are specific to mammals and are not typically applied to non-mammalian vertebrates in the same way.

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

Dental formula refers to 

  1. The minimum number of teeth in one half of one jaw

  2. The number of each type of tooth in one half of one jaw

  3. The overall geometric shape of the jaw

  4. Maximum number of teeth in the mouth
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In each set of teeth, incisors (I) are indicated first, canines (C) second, premolars (P) third, and finally molars (M), giving I:C:P:M which is the minimum number of teeth in one half of one jaw. 

So, 'the correct option is 'The minimum number of teeth in one half of one jaw'.

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

Identify typical dental formula of a metatherian.

  1. i 5/4. c 1/1, pm 3/3, m 4/4

  2. i 3/3, c 1/1, pm 4/4, m 3/3

  3. i 4/3, c 1/1, pm 3/3, m 4/4

  4. i 4/5, c 1/1, pm 3/3, m 4/4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

There is only one set of teeth functional throughout life with the exception of a milk molar which is replaced by the last premolar. Incisors are more numerous than in placentals. 3 premolars and 4 molars as against 4 P and 3 M in placentals. Dentition in opossum is I 5/4, C 1/1, P 3/3, M 4/4. 


So, the correct option is 'Option A'.

Multiple choice frog - control and coordination system frog animal diversity - ii (phylum: chordata) organ and organ systems in animals zoology

Which of the following statement is true with reference to
teeth in frog

  1. The lower jaw is toothless

  2. The upper jaw is toothless

  3. Both lower and upper jaws are toothless

  4. Both lower and upper jaws are toothed
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The lower jaw of frog is toothless. Teeth are present on premaxillae , maxillae of upper jaw.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) biological importance of magnesium and calcium biological importance of elements biological importance of s block elements

Bones and teeth contain:

  1. Calcium dihydrogen phosphate

  2. Apatite

  3. Calcium phosphide

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

Bones and teeth contains Apatite which is a group of phosphate minerals and contains calcium. Its formula can be represented as $Ca _5(PO _4) _3(F,Cl,OH)$.

Multiple choice common health problem international health bodies health organisation biology

A dental disease characterized by mottling of teeth is due to presence of a certain chemical element in drinking water. Which is that element?

  1. Boron

  2. Chlorine

  3. Fluorine

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

Fluoride is the important mineral found in teeth, bone and joint. It plays an important role in the formation of the enamel of teeth and mineralization of bones at the optimum level. But excess fluoride in drinking water and foods causes a disorder known as fluorosis. It is characterized by mottling of teeth, weak bones, stiff and painful joints (skeletal fluorosis).

Multiple choice biology health and hygiene life is precious road safety and pollution personal health care

What causes tooth decay?

  1. Acid

  2. Alkaline

  3. Caffeine

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

  • Cavities, also called tooth decay or caries, are caused by a combination of factors, including bacteria in your mouth, frequent snacking, sipping sugary drinks, levels of acid in food and not cleaning your teeth well. 
  • Cavities and tooth decay are among the world's most common health problems.  
  • Sugar isn't the only culprit when it comes to tooth decay. High levels of acid in everyday foods and drinks can be just as harmful. From oranges to wine, high-acid foods and drinks can wear away your teeth, causing decay, sensitivity and discolouring. Hence,  Acid causes tooth decay.
  So, the correct answer is 'acid'.

Multiple choice botany plant tissues introduction to tissue tissues - "the teams of workers" introduction to tissues

Name the tissues found in tooth.

  1. Enamel

  2. Cementum

  3. Dentin

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A tooth consists of enamel, dentin, cementum and pulp tissue. The portion of a tooth exposed to the oral cavity is known as the dental crown, and the portion below the dental crown is known as the tooth root. Thus, the correct answer is option D.

Multiple choice evs structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

Which of the following is not true for the care of teeth?

  1. We should not chew the food.

  2. We should not eat too many sweets.

  3. We should brush twice a day.

  4. We should eat raw fruits and vegetables.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Care of the teeth should be taken by:
  1. Brush your teeth 2 times a day with fluoride (“FLOOR-ide”) toothpaste.
  2. Visit a dentist regularly for a checkup and cleaning.
  3. Cut down on sugary foods and drinks.
  4. Don't smoke or chew tobacco etc. Hence, We should not chew the food is not true for the care of teeth.
So, the correct answer is 'We should not chew the food'.
Multiple choice evs structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

The soft, sticky layer formed on the tooth which is harmful is 

  1. Enamel

  2. Plaque

  3. Dentine

  4. Pulp
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Plaque is a soft, sticky film that builds up on your teeth and contains millions of bacteria. 
  • When you eat, the bacteria in plaque use the sugars in your food to produce acids that eat away at the tooth enamel.  Hence, The soft, sticky layer formed on the tooth which is harmful is a plaque.
So, the correct answer is 'plaque'.
Multiple choice evs structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

A dental disease characterised by mottling of teeth is due to the presence of an ingredient in drinking water, namely 

  1. Fluorine

  2. Mercury

  3. Boron

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

A dental disease characterised by mottling of teeth is due to the presence of an ingredient in drinking water, namely fluorine. Dental fluorosis or mottling of tooth enamel is a developmental disturbance of dental enamel caused by the consumption of excess fluoride during tooth development. The risk of fluoride overexposure occurs at any age but it is higher at younger ages.

Therefore, the correct answer is option A.

Multiple choice evs structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

The major reason for tooth decay are 

  1. Chocolates

  2. Sweets

  3. Cold drinks

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Tooth decay is the softening of teeth enamels and refers to the damage of the structure of the tooth. This occurs due to high consumption of chocolates, sweets and cold drinks. Tooth decay is caused by acids that are created when plaque bacteria break down sugar in the mouth. 

So, the correct answer is  'All of the above'.