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

The measures to prevent tooth decay are

  1. Dental floss

  2. Brush

  3. Rinsing the mouth after meals

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

Tooth decay starts with the erosion of tooth enamel and leads to holes in teeth called cavities. The measures to prevent tooth decay are to brush the teeth twice a day, dental floss, skip sugar, rising the mouth after meals.

So the correct answer is "All of the above". 

Multiple choice business mathematics and statistics random variable and mathematical expectation discrete and continuous data random variable random variable and its types

How many times will you brush your teeth. The answer is an example of which type of variable?

  1. continuous

  2. dependent

  3. nominal

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

A discrete variable is a variable whose value is obtained by counting.
So, how many times will you brush your teeth is countable.

Multiple choice biology structural organization of animals structural organization of rabbit structural organization of leech phylum annelida

Diastema is a toothless gap in the jaws of rabbit between ______________.

  1. Premolars and molars

  2. Incisors and molars

  3. Canines and molars

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

In herbivores like rabbits, the diastema is a gap in the jaw lacking teeth, situated specifically between the incisors and the premolars. This adaptation accommodates their specialized gnawing and chewing habits.

Multiple choice chemistry introduction to acid and base neutralisations in everyday life acids and bases in daily life neutralisation reaction

To protect tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is:

  1. acidic

  2. basic

  3. netural

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

Mouth has salivary amylase enzyme and the process of digestion starts from mouth making the acidic environment which causes the tooth decay so it is neutralized by using toothpaste basic in nature.

Multiple choice

I need to go to the dentist. I've got a ...

  1. toothache

  2. tooth ache

  3. teethache

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

The correct compound noun is 'toothache'. The other options are either misspelled or use the plural 'teeth' incorrectly in this context.

Multiple choice zoology immune system active and passive immunity immunity related disorders and problems diseases and immunity

Graft between individuals of different species is called 

  1. Xenograft

  2. Isograft

  3. Autograft

  4. Allograft
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Grafting refers to a surgical procedure to move tissue from one site to another on the body, or from another creature, without bringing its own blood supply with it. Instead, a new blood supply grows in after it is placed.
  • There are 4 types of grafting techniques. They are Allograft, Autograft, Isograft and Xenograft.
  • Xenograft is the Grafting between two individuals of different species. Most commonly from animal to man such as pig heart valve used to replace human.
  • Hence Graft between individuals of different species is called  Xenograft.
  • So, the correct answer is 'Xenograft'.
Multiple choice evs let's clean together cleanliness who will do this work? personal and public cleanliness

Improper care of teeth can result in

  1. Cavities

  2. Tooth pain

  3. Falling of teeth

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

Brushing of teeth twice a day is recommended even by doctors for strong gums and teeth. It is a part of personal hygiene. If proper care is not taken it may lead to the cavity in the teeth and hence, blackening. Cavity further can result in severe pain and also fall of teeth. Brushing, if not done properly can also lead to bad breath which is not considered clean. 

Therefore, the correct answer is option D.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Premolar are absent in 

  1. Adult teeth in man

  2. Mammalian teeth in general

  3. Permanent teeth of man

  4. Deciduous teeth of man
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Humans have two sets of teeth- the deciduous or milk teeth and the permanent teeth. The milk premolars are absent in infants. Thus, dental formula of infants are 2102/ 2102 as against 2123/ 2123 in adult humans.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

In mammals, the teeth are 
(i) Of different types
(ii) Embedded in the cup-like socket of the jaw bones
(iii) Only two sets, present throughout life
These conditions are referred as 

  1. Heterodont, thecodont and diphyodont

  2. Thecodont, heterodont and diphyodont

  3. Diphyodont, thecodont and heterodont

  4. Heterodont, diphyodont and thecodont

  5. Thecodont, diphyodont and heterodont
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
In mammals, the teeth is a heterodont as they have for different variety of teeth like incisors, canines, premolars and molars. The teeth is embedded in the sockets so they are also known as thecodont. Initially mammals have milk teeth, which is further replaced by the milk teeth. The two sets of teeth is known as diphyodont.
So, the correct answer is option A.
Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Number of teeth  which are monophyodont in man are

  1. 4

  2. 22

  3. 32

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

Majority of mammals including human being forms two sets of teeth during their life, a set of temporary, milk or deciduous teeth replaced by a set of permanent or adult teeth. This type of dentition is called diphyodont. An adult human has 32 permanent teeth, which are of four different types, namely, incisors (I), canine (C), premolars (PM) and molars(M). Arrangement of teeth in each half of the upper and lower jaw in the order I, C, PM, M is represented by a dental formula which in humanis 2123/ 2123. In children the premolars and last molar are absent. Hence the child has dental formula 2102/ 2102. The number of teeths according to this dental formula will be 20. These teeth will be diphyodont and (32-20) or 12 teeth will be monophyodont.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

The hardest constituent of the tooth is

  1. Enamel

  2. Dentine

  3. Bone

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

Enamel is the hardest substance in the human body and contains the highest percentage of minerals, 96%, with water and organic material. The primary mineral is hydroxyapatite, which is a crystalline calcium phosphate.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Amount of water in enamel is

  1. 90 - 92%

  2. 75 - 80%

  3. 40 - 50%
  4. $\approx $ 3%
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Enamel is the hardest material of animal kingdom. Enamel is ectodermal. It is secreted by Ameloblast cells of the ectoderm. lt has maximum amount of inorganic salt (96%) in It. Inorganic salt are mainly found in the form of phosphate and carbonate of Ca, Mg, Na and K. 3% of water is found in the enamel. Along with it Keratin and  ossein are also found in teeth. Ossein is a protein of bones, remaining part of tooth develops from mesoderm of embryo.