Tag: structure and functions of living organisms -ii

Quizzes (17) Questions (133)

Questions Related to structure and functions of living organisms -ii

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

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

  1. Enamel

  2. Plaque

  3. Dentine

  4. Pulp
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.
Multiple choice evs structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

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

  1. Fluorine

  2. Mercury

  3. Boron

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

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

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

  1. Pancreas

  2. Thyroid gland

  3. Adrenal gland

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

Salivary glands are characteristic of mammals. Frogs and other amphibians lack true salivary glands, although they have glands that secrete mucus to moisten food.

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

The major reason for tooth decay are 

  1. Chocolates

  2. Sweets

  3. Cold drinks

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

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

The measures to prevent tooth decay are

  1. Dental floss

  2. Brush

  3. Rinsing the mouth after meals

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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". 

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

Vertebrate salivary glands and exocrine part of pancreas are.

  1. Apocrine

  2. Holocrine

  3. Both A and B

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

Merocrine secretion is a process where cells release products via exocytosis without losing any part of the cell itself. Both salivary glands and the exocrine pancreas use this mechanism.