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 biology reproduction in living organisms regeneration asexual modes of reproduction reproduction in animals

Which of the following step of regeneration stops the bleeding at the site of amputation?

  1. Wound closure

  2. Redifferentiation

  3. Dedifferentiation

  4. Blastema formation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Regeneration process in higher animals involves a series of steps.1)Wound closure 2) Demolition and Defence 3)De-differentiation 4)Blastema Formation 5) Growth and 6)Re-differentiation.
  • WOUND HEALING: Amputation or injury to organ results in exposure of the interior tissues to the outside. Some cells in the injured region get destroyed. There may be bleeding at the injured surface. The blood soon clots and blocks further flow of blood to the outside. Hence bleeding is stopped.
  • Then the epidermal cells proliferate and migrate from all sides towards the center of the wound. Thus the epithelium forms a complete covering over the injured tissues underneath the blood clot. 
  • Hence Wound closure step of regeneration stops the bleeding at the site of amputation.
  • So, the correct answer is 'Wound closure'.
Multiple choice biology reproduction in living organisms regeneration asexual modes of reproduction reproduction in animals

Restorative regeneration decreases with

  1. Increase in complexity of organisation

  2. Decrease in organisational complexity

  3. Development of hormones

  4. Development of nerves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Formation of new parts of the body, which are lost due to injury or accidents is called Restorative regeneration. It decreases with increase in complexity of body organisation.

So, the correct option is ‘increase in complexity of organisation’.

Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

Tooth extraction in a person causes death due to excessive bleeding. This is because of

  1. Absence of prothrombin

  2. Presence of plasma factor that causes haemorrhage

  3. Presence of plasma factor that prevents blood clotting

  4. Absence of plasma factor required for haemorrhage
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Prothrombin is a glycoprotein occurring in blood plasma and is an essential component of the blood-clotting mechanism. Prothrombin is transformed into thrombin by a clotting factor known as factor X or prothrombinase; thrombin then acts to transform fibrinogen, also present in plasma, into fibrin, which, in combination with platelets from the blood, forms a clot (coagulation). Under normal circumstances, prothrombin is changed into thrombin only when an injury occurs to the tissues or circulatory system or both; therefore, fibrin and blood clots are not formed except in response to bleeding. Hypoprothrombinemia, a deficiency in prothrombin, is characterized by a tendency to prolonged bleeding. It is usually associated with a lack of vitamin K, which is necessary for the synthesis of prothrombin in the liver cells. 

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 biology windows of knowledge human tongue organ of taste tongue : the organ of taste

Rough texture of the tongue is due to

  1. Muscosa

  2. Toongue bud

  3. Papillae

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

The rough texture of the tongue surface is caused by papillae, which are small nipple-like projections on the tongue epithelium. These include fungiform, filiform, circumvallate, and foliate papillae, with filiform papillae being the most numerous and responsible for the tongue's rough surface texture.

Multiple choice biology soldiers of defense human lymphatic system lymph and its function lymph and tissue fluid

Red pulp and white pulp are histological structure found in

  1. Tooth

  2. Spleen

  3. Bone

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

Spleen is the largest lymph node of body. A special type of connective tissue is filled in spleen, which is called pulp. Splenic pulp has two parts - white pulp and red pulp. The white pulp is scattered in the form of patches of long and irregular sized lymphatic endothelium. The meshes of this network are studded with numerous splenic cells and lymphocytes. The red pulp forms major part of spleen. It is reddish in colour due to excessive RBCs. It is made up of venous sinuses. Red pulp of spleen contains erythrocytes and blood filled sinuses.

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

Cheek teeth are

  1. Inscisors and canines

  2. Canines and premolars

  3. Premolars and molar

  4. Canines and molars
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cheek teeth or post canines comprise the molar and premolar teeth in mammals. Cheek teeth are multicuspidate (having many cusps or tubercles). Mammals have multicuspidate molars.

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

Incisor present in which bone of human jaw?

  1. Premaxilla

  2. Maxilla

  3. Palatine

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

  • The premaxilla is one of a pair of small cranial bones at the very tip of the upper jaw of many animals, usually, but not always, bearing teeth. 
  • In humans, they are fused with the maxilla and usually termed as the incisive bone (the portion of the maxilla adjacent to the incisors). Hence,  Incisor is present in premaxilla of the human jaw.
So, the correct answer is 'premaxilla'.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid

Total number of teeth in rabbit is

  1. 43

  2. 24

  3. 28

  4. 32
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rabbit is herbivorous animal and depends on cellulose based food. It has no canines in jaw. The dental formula is  2 0 3 3 / 1 0 2 3 for incisors, canine, premolar and molars in each jaw. The total number of teeth in upper jaw are 16 and 12 teeth in lower jaw. Thus total number of teeth are 28.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid

If the dental formula of rabbit is $\frac { 2033 }{ 1023 } $. What does it show?

  1. Total number of teeth in rabbit is 15.

  2. Number of total incisors in rabbit is 3.

  3. Diastema is present between incisors & premolars.

  4. In the formula 2033 is for adult and 1033 is for young ones.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rabbit is herbivorous animal and depends on cellulose based food. It has no canines in jaw. The dental formula is  2 0 3 3 / 1 0 2 3 for incisors, canine, premolar and molars in each jaw. Thus the canines are absent. There is a gap in both the jaws at the location of canines. It is called as diastema. The total number of teeth in upper jaw are 16 and 12 teeth in lower jaw. The total number of teeth are 28.