Tag: circulatory system and organs

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Multiple choice evs structure and functions of living organisms -ii experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

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

  1. Flourine

  2. Mercury

  3. Boron

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

Dental fluorosis, also termed as mottled enamel is an extremely common disorder. It is caused by overexposure to fluoride during the first eight years of life. This is the time when most permanent teeth are being formed. Clinical dental fluorosis is characterized by staining and pitting of the teeth. In more severe cases all the enamel may be damaged.. The early symptoms of skeletal fluorosis, include stiffness and pain in the joints.  Hence, the dental disease characterised by mottling of teeth is due to the presence of an ingredient in drinking water is fluorine.

So the correct answer is ''fluorine''

 

 

Multiple choice evs structure and functions of living organisms -ii experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Teeth that are different in shape, size and function are called as

  1. Acrodont

  2. Pleurodont

  3. Homodont

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

Heterodont is an animal which possesses more than a single tooth morphology. For example, humans possess incisors, canines (eyeteeth), premolars and molars.

Homodont is an animals whose teeth are all of the same type. Most vertebrates except mammals are homodont. 
Pleurodont is a formation of the teeth that are fused  by their sides to the inner surface of the jaw bones.
Acrodont is a formation of the teeth whereby the teeth are consolidated with the summit of the alveolar ridge of the jaw without sockets. The term also refers to species of reptiles that have such a formation.

Multiple choice evs structure and functions of living organisms -ii experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Grinding and chewing teeth are called as

  1. Premolars

  2. Canines

  3. Incisors

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

Adult human teeth have 12 molars. They are biggest and strongest teeth. The large surface are o molars helps in grinding and chewing the food. They break up the food into pieces small enough for making it easy to swallow.

So, the correct answer is "Molars".

Multiple choice evs structure and functions of living organisms -ii experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Layer of cells that secrete enamel of tooth is 

  1. Osteoblast

  2. Ameloblast

  3. Odontoblast

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

Osteoblast-bone forming cell. Ameloblast-enamel elaborating cell. Odontoblast- dentine elaborating cell. Dentoblast- tooth cell.

Multiple choice evs structure and functions of living organisms -ii experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

The teeth placed at the end of the buccal cavity and help in chewing food are which of the following?

  1. Incisors

  2. Molars

  3. Canines

  4. Premolars
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The most posterior teeth in the mouth are the molars. They have broader and flatter surfaces with 4-5 cusps. They help in chewing and grinding the food.
So the correct answer is 'Molars'.
Multiple choice biology structure and functions of living organisms -ii role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

An adult has ............. teeth. 

  1. 20

  2. 24

  3. 28

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

A normal adult mouth has 32 teeth. 

  •  Incisors: The middlemost four teeth on the upper and lower jaws.
  • Canines: The pointed teeth just outside the incisors. 
  • Premolars: Teeth between the canines and molars.
  • The molars or molar: teeth are large, flat teeth at the back of the mouth. Hence, an adult has 32 teeth.
So, the correct answer is '32'.

Multiple choice biology structure and functions of living organisms -ii role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Cavity present in the tooth is called as

  1. Pulp cavity

  2. Nasal cavity

  3. Abdominal cavity

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

Pulp cavity is the central cavity of a tooth containing the dental pulp and being made up of the root canal and the pulp chamber. Nasal cavity is present in nose, abdominal cavity in abdomen and chest cavity in chest.

Therefore, the correct answer is option A.

Multiple choice biology structure and functions of living organisms -ii role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

The study of teeth is called as

  1. Dentistry

  2. Dermatology

  3. Neurology

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

The study of teeth generally referred to as dentistry. It is a branch of medicine that involves the study, diagnosis, prevention, and treatment of diseases, disorders and conditions of the dentition along with oral cavity, including the oral mucosa, and the adjacent and related structures and tissues of the maxillofacial zone.

Multiple choice biology structure and functions of living organisms -ii role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

We chew the food with the

  1. Teeth

  2. Tongue

  3. Mouth

  4. None of the above
Reveal answer Fill a bubble to check yourself
A 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 by the cheek and tongue between the teeth for grinding. The muscles of mastication move the jaws to bring the teeth into intermittent contact, repeatedly occluding and opening. As chewing continues, the food is made softer and warmer, and the enzymes in saliva begin to break down carbohydrates in the food. After chewing, the food (now called a bolus) is swallowed. It enters the esophagus and via peristalsis continues on to the stomach, where the next step of digestion occurs.
Multiple choice biology structure and functions of living organisms -ii role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Match the following.

A. Incisors 1. Grinding teeth
B. Canines 2. Cracking teeth
C. Premolars 3. Cutting teeth
D. Molars 4. Tearing teeth

  1. A- 2, B- 4, C- 1, D- 3

  2. A- 2, B-1 , C- 4, D- 3

  3. A- 3, B- 2, C- 4, D- 1

  4. A- 3, B- 4, C- 2, D- 1
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Incisor is a narrow-edged tooth at the front of the mouth, adapted for cutting. In humans there are four incisors in each jaw. On each side of the incisors, at the corners of the mouth, are the canines. These teeth have one cusp, or pointed edge, and are used for holding or grasping food, and are very strong, stable teeth. Behind the canines are the premolars, which are designed for holding food like the canines because they have cusps, but they also function to crush food. Sometimes these teeth are referred to as bicuspids, meaning two cusps, but this is not always accurate because some premolars may have three cusps. Therefore, the term premolar is preferred. The teeth farthest back in the mouth are the molars. These teeth have broad chewing surfaces with four or five cusps, and are designed for grinding food. Thus, option D is correct.