Tag: salivary glands

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Questions Related to salivary glands

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 salivary glands produce saliva. What is the function of saliva?

  1. Digestion of food

  2. Purification of blood

  3. Keeping our body cool

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Saliva is a thick, colourless and glistening liquid with about 98 per cent water in our mouth. The saliva contains chemicals like the mucus, salts, antibacterial substances and enzymes which help in the digestion of food especially starch.
  • The digestion of starch into a sugar called the maltose is done because of an enzyme, salivary amylase that the saliva contains. 
Multiple choice biology structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

Acid neutraliser present in mucus of saliva is

  1. Bicarbonate ion

  2. Thiocyanate

  3. Sodium acetate

  4. Sodium hydroxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Saliva contains bicarbonate ions, which act as a buffer to neutralize acids produced by bacteria or present in food, helping to maintain a neutral pH in the mouth and protect tooth enamel.

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 saliva secreted by salivary glands not  

  1. Contain electrolytes like $Na^+,K^+, CI^-$ and $3 HCO _3^+$

  2. Give safely against dental carries
  3. Bring about hydrolysis of starch upto $90\%$

  4. Initiate the process of digestion
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Saliva secreted by salivary glands doesn't give safety against dental caries.
  • Dental carries take place due to deposition of food particles on teeth and subsequent bacterial decay.
  • So, the correct option is 'Give safely against dental carries'.
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 part of the animal body with both endocrine and exocrine function is 

  1. salivary gland

  2. stomach

  3. pancreas

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

The pancreas is a heterocrine gland containing both endocrine tissue (islets of Langerhans secreting insulin and glucagon) and exocrine tissue (acinar cells secreting digestive enzymes into ducts).

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

In salivary gland chromosomes/polytene chromosomes, pairing is?

  1. Absent

  2. Occasional

  3. Formed between non-homologous chromosomes

  4. Formed between homologous chromosomes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Polytene chromosomes found in the salivary glands of dipteran insects undergo somatic pairing, where homologous chromosomes closely pair up side by side throughout their length.

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

With reference to a normal human being, which one of the following statements is not correct?

  1. Human saliva is slightly alkaline
  2. An adult human may secrete $1-1.5$L of saliva per day

  3. Saliva is secreted by six pairs of salivary glands in human beings

  4. The salivary enzyme(ptyalin) breaks down cooked starch into maltose
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Humans have three pairs of major salivary glands, not six pairs. The other statements are correct: human saliva is slightly acidic to neutral (though often cited around pH 6.8, effectively close to neutral or slightly alkaline depending on flow rate, but the gland count of six pairs total, meaning three on each side, makes option C false as it states six pairs meaning twelve pairs total).

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

Which of the following is not true for the care of teeth?

  1. We should not chew the food.

  2. We should not eat too many sweets.

  3. We should brush twice a day.

  4. We should eat raw fruits and vegetables.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Care of the teeth should be taken by:
  1. Brush your teeth 2 times a day with fluoride (“FLOOR-ide”) toothpaste.
  2. Visit a dentist regularly for a checkup and cleaning.
  3. Cut down on sugary foods and drinks.
  4. Don't smoke or chew tobacco etc. Hence, We should not chew the food is not true for the care of teeth.
So, the correct answer is 'We should not chew the 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

Fill the blank
Sugar + Plaque $\rightarrow$ 

  1. Starch

  2. Enamel

  3. Acids

  4. Microbes
Reveal answer Fill a bubble to check yourself
C 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, Sugar + Plaque → acids.
So, the correct answer is 'acids'.