Tag: structure and functions of living organisms -ii

Questions Related to structure and functions of living organisms -ii

The soft, sticky layer formed on the tooth which is harmful is 

evs structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

  1. Enamel

  2. Plaque

  3. Dentine

  4. Pulp

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Correct Option: B
Explanation:
  • Plaque is a soft, sticky film that builds up on your teeth and contains millions of bacteria. 
  • When you eat, the bacteria in plaque use the sugars in your food to produce acids that eat away at the tooth enamel.  Hence, The soft, sticky layer formed on the tooth which is harmful is a plaque.
So, the correct answer is 'plaque'.

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

evs structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

  1. Fluorine

  2. Mercury

  3. Boron

  4. Chlorine

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Correct Option: A
Explanation:

A dental disease characterised by mottling of teeth is due to the presence of an ingredient in drinking water, namely fluorine. Dental fluorosis or mottling of tooth enamel is a developmental disturbance of dental enamel caused by the consumption of excess fluoride during tooth development. The risk of fluoride overexposure occurs at any age but it is higher at younger ages.

Therefore, the correct answer is option A.

The structure present is man but absent in frog is ___________.

biology structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

  1. Pancreas

  2. Thyroid gland

  3. Adrenal gland

  4. Salivary gland

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Correct Option: D

The major reason for tooth decay are 

evs structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

  1. Chocolates

  2. Sweets

  3. Cold drinks

  4. All of the above

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Correct Option: D
Explanation:

Tooth decay is the softening of teeth enamels and refers to the damage of the structure of the tooth. This occurs due to high consumption of chocolates, sweets and cold drinks. Tooth decay is caused by acids that are created when plaque bacteria break down sugar in the mouth. 

So, the correct answer is  'All of the above'.

The measures to prevent tooth decay are

evs structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

  1. Dental floss

  2. Brush

  3. Rinsing the mouth after meals

  4. All of the above

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Correct Option: D
Explanation:

Tooth decay starts with the erosion of tooth enamel and leads to holes in teeth called cavities. The measures to prevent tooth decay are to brush the teeth twice a day, dental floss, skip sugar, rising the mouth after meals.

So the correct answer is "All of the above". 

Vertebrate salivary glands and exocrine part of pancreas are.

biology structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

  1. Apocrine

  2. Holocrine

  3. Both A and B

  4. Merocrine

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Correct Option: D

Spot the salivary gland among the following

biology structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

  1. Sublingual

  2. Adrenal

  3. Brunner

  4. Lacrymal

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Correct Option: A
Explanation:

In human, 3.pairs of salivary glands are present. They are sublingual , parotid  and submaxillary .

Parotid salivary glands occur

biology structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

  1. Below ears/external acoustic meatus

  2. Below tongue

  3. At the angle of jaws

  4. Below orbits

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Correct Option: A

Lysozymes are found in

biology structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

  1. Saliva

  2. Tears

  3. Both saliva and tears

  4. Mitochondria

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Correct Option: C

Amount of saliva secreted per day is

biology structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

  1. 250 ml

  2. 500 ml

  3. 750 ml

  4. 1000 ml

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Correct Option: D