Tag: introduction to human digestive system

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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

Human dentition is described as

  1. Heterodont, diphyodont and thecodont

  2. Heterodont, monophyodont and thecodont

  3. Heterodont, diphyodont, thecodont and bundodont

  4. Heterodont, polyphyodont and pleurodont
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

Nasal chamber is divided in tow parts by?

  1. Sphenoid bone

  2. Palatine bone

  3. Mesethemoid cartilage

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

The nasal cavity is divided into two lateral halves by the nasal septum, which is formed by the vomer, the perpendicular plate of the ethmoid bone, and the septal cartilage.

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

  1. Canines

  2. Incisors

  3. Premolars

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

Molars are broad, flat teeth located at the back of the mouth, specially adapted for crushing, grinding, and chewing food into smaller pieces suitable for digestion.

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

Maximum number of teeth found in placental mammals is

  1. 32

  2. 54

  3. 44

  4. 22
Reveal answer Fill a bubble to check yourself
C Correct answer
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

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

Number of teeth in man which grow twice are

  1. 4

  2. 8

  3. 12

  4. 28

  5. 20
Reveal answer Fill a bubble to check yourself
E Correct answer
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.

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

Diastema is

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Pulp cavity of teeth is lined by

  1. Odontoblast

  2. Chondroblast

  3. Osteoblast

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

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

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

  1. Wisdom tooth

  2. Incisor

  3. Molar

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

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

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

Diastema is associated with

  1. Presence of certain teeth

  2. Absence of certain teeth

  3. Absence of tongue

  4. Presence of tongue
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Among mammals, an herbivore has

  1. More teeth than carnivore

  2. Flatter teeth than carnivore

  3. Teeth that are more pointed than carnivore

  4. Fever teeth than a carnivore
Reveal answer Fill a bubble to check yourself
B Correct answer
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.