Tag: introduction to human digestive system

Questions Related to introduction to human digestive system

Human dentition is described as

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

  1. Heterodont, diphyodont and thecodont

  2. Heterodont, monophyodont and thecodont

  3. Heterodont, diphyodont, thecodont and bundodont

  4. Heterodont, polyphyodont and pleurodont

Show answer
Correct Option: A
Explanation:

Human dentition can be describes as:

Heterodont: the teeth are morphologically different from each other.
Diphyodont: there are two sets of teeth that appear in the lifetime, the milk-teeth and the permanent teeth.
Thecodont: the teeth are firmly enclosed within the deep socket of the jaw bone.
Hence, the correct answer is 'Heterodont, diphyodont and thecodont'.

Nasal chamber is divided in tow parts by?

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

  1. Sphenoid bone

  2. Palatine bone

  3. Mesethemoid cartilage

  4. Zygomatic bone

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Correct Option: A

The teeth which help us in chewing and grinding the food we eat are?

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

  1. Canines

  2. Incisors

  3. Premolars

  4. Molars

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Correct Option: A

Maximum number of teeth found in placental mammals is

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

  1. 32

  2. 54

  3. 44

  4. 22

Show answer
Correct Option: C
Explanation:

Placental mammals have a maximum of three incisors and one canine per quadrant and usually have no more than four premolars and three molars per quadrant. Following dental formula represents the number of tooth in placental mammals.
Placental mammals =  I 3/3 C 1/1 P 4/4 M 3/3 =44

Number of teeth in man which grow twice are

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

  1. 4

  2. 8

  3. 12

  4. 28

  5. 20

Show answer
Correct Option: E
Explanation:

Humans, like other mammals, are diphyodont, meaning that they develop two sets of teeth. Among deciduous (primary) teeth, ten are found in the maxilla (upper jaw) and ten in the mandible (lower jaw), for a total of 20. The dental formula for primary teeth is 2.1.2/2.1.2.

Diastema is

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

  1. A part of pelvic girdle in rabbit.

  2. A type of tooth in rabbit.

  3. Space in teeth lines in some mammals.

  4. Structure in eye of rabbit.

Show answer
Correct Option: C
Explanation:

A diastema is a space or gap between two teeth. It happens when there is an unequal relationship between the size of the teeth and the jaw.

Pulp cavity of teeth is lined by

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

  1. Odontoblast

  2. Chondroblast

  3. Osteoblast

  4. Amyloblast

Show answer
Correct Option: A
Explanation:

Odontoblast is one of the dentin-forming cells, derived from mesenchyme of neural crest origin, lining pulp cavity of teeth; arranged in a peripheral layer in dental pulp, each with an odontoblastic process extending part way into dentinal tubules.

In human teeth, which of the following helps in cutting?

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

  1. Wisdom tooth

  2. Incisor

  3. Molar

  4. Premolar

Show answer
Correct Option: B
Explanation:

The four front teeth in each arch are called incisors, and their function is to cut food with their sharp thin edges.

Diastema is associated with

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

  1. Presence of certain teeth

  2. Absence of certain teeth

  3. Absence of tongue

  4. Presence of tongue

Show answer
Correct Option: B
Explanation:

A diastema is an area of extra space between two or more teeth. The two front teeth of the upper jaw area is where diastema is most frequently seen. Many children experience diastema as primary teeth fall out, though in most cases these spaces close when the permanent teeth erupt. Diastemas may also be caused by a tooth size discrepancy, missing teeth or an oversized labial frenum, the tissue that extends from the inside of the lip to the gum tissue where the upper two front teeth are located. Secondary reasons involve oral alignment issues such as a protrusion of the teeth. Thus, option B is correct.

Among mammals, an herbivore has

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

  1. More teeth than carnivore

  2. Flatter teeth than carnivore

  3. Teeth that are more pointed than carnivore

  4. Fever teeth than a carnivore

Show answer
Correct Option: B
Explanation:

The teeth of a carnivore are long and pointed, for tearing raw flesh. Herbivores have flat teeth and flat back molars to grind their food. Carnivores do not have flat back molars at all.  Some herbivores do have small, what we call “canine” teeth for biting into tough plants like apples but these are nothing compared to the size and shape of a carnivore’s teeth. True omnivores teeth are most similar to carnivore teeth. Thus, option B is correct.