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

Which of the following is a soft material in the tooth?

  1. Root

  2. Dentine

  3. Pulp

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

Dental pulp is an unmineralized oral tissue composed of soft connective tissue, vascular, lymphatic and nervous elements that occupies the central pulp cavity of each tooth. Pulp has a soft, gelatinous consistency. The pulp cavity extends down through the root of the tooth as the root canal which opens into the periodontium via the apical foramen. The blood vessels, nerves etc. of dental pulp enter and leave the tooth through this foramen. This sets up a form of communication between the pulp and surrounding tissue - clinically important in the spread of inflammation from the pulp out into the surrounding periodontium. 

Therefore, the correct answer is option C.

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

Dentine is

  1. Hard, protective covering on the tooth.

  2. The cavity which contains nerves and blood vessels in a tooth.

  3. Covering beneath the enamel.

  4. The nerve that connects tooth and the brain.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Dentine is the calcified tissue of the body, is one of the components of the teeth along with enamel, cementum and pulp. It is generally surrounds the entire pulp is a covering beneath the enamel. 70% of the weight of dentine is made up of mineral hydroxylapatitie, while 20% is organic material and the rest 10% is water.

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 type of teeth used to tear a sugarcane is

  1. Incisors

  2. Canines

  3. Premolars

  4. Molars
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • The canines are the pointed and the sharp teeth which are found in the mouth of the humans. 
  • These are the teeth that are used for tearing of the food. The sugarcane is made up of tough fibers. These fibers can be torn with the help of canine teeth. 
  • Thus, the correct answer is option B. 
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

Grandpa lost his teeth that could never be replaced naturally because they were

  1. Permanent teeth

  2. Milk teeth

  3. Both A and B

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

Human teeth have two sets of teeth during their life one temporary set of milk teeth and one permanent set. Once the milk teeth have replaced by permanents, then the permanent teeth are not going to replace again in life naturally after 12 years of age.

So the correct answer is 'Permanent teeth".

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 present after the age of 8-12 is called as

  1. Milk teeth

  2. Temporary teeth

  3. Permanent teeth

  4. Both A and C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Human teeth have two sets of teeth during their life i.e, one temporary set of milk and one permanent set. The temporary teeth or milk teeth are replaced by permanent teeth upon the age of 12 years. So the teeth present after 12 years of age is called permanent teeth.
So the correct answer is 'Permanent teeth'.
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

Soham is 6 years old. He was playing in the garden. One of his teeth fell as he dashed a pillar. He started crying because he was hurt. He also felt that his teeth will never come back and he will not be able to eat chocolates. How will you console him?

  1. By telling him that his tooth was milk tooth

  2. By telling him that his tooth was permanent tooth

  3. By telling him that his tooth will be replaced

  4. Both A and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Human teeth have two sets of teeth during their life: one temporary set (milk teeth) and one permanent set milk teeth are young teeth that are replaced by permanent or adult teeth up to 12 years.

So the correct answer is 'Both A and C'.

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 used for biting and cutting food are called as

  1. Molars

  2. Premolars

  3. Canines

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

An adult human has 32 permanent teeth which of four types, namely incisors, canines, premolar, and molars. Such type of dentition is called heterodont dentition.

The teeth used for biting and cutting food are called as Incisors. They are small chisels shaped and have sharp edge help to bite the food.
So, the correct answer is "Incisors".

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

Which of the following is vestigial teeth found in human?

  1. Incisors

  2. Premolars

  3. Diphyodont

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

Wisdom teeth are vestigial third molars, that help human ancestors in grinding down plant tissue. The skulls of human ancestors had larger jaws with more teeth to efficiently digest the cellulose that makes up a plant cell wall. As human diets changed, smaller jaws were naturally selected, yet the third molars or wisdom teeth still develop in humans.

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

Wisdom teeth in human is

  1. $3^{rd}$molar and 4 in number
  2. $3^{rd}$ molar and 2 in number
  3. $2^{nd}$molar and 4 in number
  4. $2^{nd}$ molar and 2 in number
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In humans, there are 32 teeth present in which four different types of teeth are present and is known as heterodont dentition. In these four types canines,

incisors, premolar and two molars are present are the permanent teeth but and are 28 in number but the third molar appears late in life and is known as wisdom tooth which is four in number an form 32 teeth.
So the correct option is '$3^{rd}$ molar and 4 in number'.