Tag: structure and functions of living organisms -ii

Questions Related to structure and functions of living organisms -ii

Which of the following statements is incorrect regarding lysozyme present in saliva?

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

  1. It acts is an antibacterial agent.

  2. It prevents infections.

  3. It acts as an enzyme.

  4. All of these

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Correct Option: C
Explanation:

The correct answer is (c).

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

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

  1. Digestion of food

  2. Purification of blood

  3. Keeping our body cool

  4. None of these

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Correct Option: A
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. 

Silk is the product of

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

  1. Salivary gland of the larva

  2. Cuticle of the adult

  3. Cuticle of the larva

  4. Salivary gland of the adult

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Correct Option: A
Explanation:

Among other visceral organs larva contains well- developed paired glands called silk glands. Silk is the secretion of salivary gland.

Acid neutraliser present in mucus of saliva is

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

  1. Bicarbonate ion

  2. Thiocyanate

  3. Sodium acetate

  4. Sodium hydroxide

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Correct Option: A

The saliva secreted by salivary glands not  

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

  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

Show answer
Correct Option: B
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'.

The part of the animal body with both endocrine and exocrine function is 

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

  1. salivary gland

  2. stomach

  3. pancreas

  4. thyroid

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Correct Option: A

In salivary gland chromosomes/polytene chromosomes, pairing is?

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

  1. Absent

  2. Occasional

  3. Formed between non-homologous chromosomes

  4. Formed between homologous chromosomes

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Correct Option: A

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

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

  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

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Correct Option: A

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

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

  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.

Show answer
Correct Option: A
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'.

Fill the blank
Sugar + Plaque $\rightarrow$ 

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

  1. Starch

  2. Enamel

  3. Acids

  4. Microbes

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Correct Option: C
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'.