Short answer question. Why is it advantageous to breathe through the nose than through the mouth? - Biology

Short Note

Short answer question.

Why is it advantageous to breathe through the nose than through the mouth?



i. Nose filters and warms the inhaled air. Hair in the nose prevents the entry of microbes, dust, and other impurities which may harm the lungs.

ii. Mouth lacks any such structures for filtering and warming the air that is inhaled during inspiration. Hence, it is advantageous to breathe through the nose than through the mouth.

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Chapter 8: Respiration and Circulation - Exercises [Page 181]


Balbharati Biology 12th Standard HSC for Maharashtra State Board
Chapter 8 Respiration and Circulation
Exercises | Q 4.1 | Page 181


Differentiate between cyclic and non-cyclic photophosphorylation.

What is 'photophosphorylation'?

Why does an athlete breathe faster and deeper than usual after finishing the race?

Why do we often sneeze when we inhale a lot of dust-laden air?

Take three test-tubes. Fill 3/4th of each with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of CO2?

Tick the correct answer:

Normal range of breathing rate per minute in an average adult person at rest is

Tick the correct answer:

During exhalation, the ribs

Mark ‘T’ if the statement is true and ‘F’ if it is false:

The size of the chest cavity increases during inhalation. (T/F)

Answer briefly the following:

What is the difference between breathing and respiration?

Write true or false for the following statement. Rewrite the false statement correctly.

Respiration and breathing are two different processes.

How is the process of respiration different from breathing?

Choose the correct alternative.

_______ muscles contract when the external intercostal muscles contract.

Distinguish between open circulation and closed circulation.

Long answer question:

Smita was working in a garage with the doors closed and automobile's engine running. After some time she felt breathless and fainted. What would be the reason? How can she be treated?

In human respiration, chemical energy is released in the form of ______.

Give any two effects of carbon monoxide poisoning.

Define Hamburger’s phenomenon. Add a note on it.

______ nerve is located at the end of the eyes behind the retina.

Differentiate between inhalation and exhalation.

Explain the mechanism of breathing.

Dr. Usha is a pulmonologist (Doctor for respiratory diseases). One day, a school student named Arjun, met her with respiratory problems. After diagnosis, the doctor advised him to go to playground daily and play football or basketball. She also advised him to do pranayamam in the morning.

  1. Why did the doctor advise him to go to the playground?
  2. What is the use of pranayamam?

Explain why you are not able to breathe normally when you are in closed and crowded places?

Intercostal muscles are found between the ______.

The Tidal Volume of a normal person is ______.

During inspiration, the diaphragm ______.

When 1500 mL air is in the lungs, it is called ______.

Vital capacity is ______.

After a long deep breath, we do not respire for some seconds due to ______.

Make the correct pairs.

Column – I Column – II
(P) IC i. maximum volume of air breathe in after forced.
(Q) EC ii. Volume of air present after expiration in lungs.
(R) VC iii. Volume of air inhaled after expiration.
(S) FRC iv. Volume of air present after expiration in lungs.

Make the correct pairs.

Column – I Column – II
(P) Tidal volume i. 1000 to 1100 ml
(Q) Residual volume ii. 500 ml
(R) Expiratory reserve volume iii. 2500 to 3000 ml
(S) Inspiratory reserve volume iv. 1100 to 1200 ml

Resistance in the airways is typically low. Why? Give two reasons.

______ is formed when carbon monoxide combines with haemoglobin.

During inspiration, the inter-costal muscles ____________.

Which of the following is CORRECT with reference to oxygen dissociation curve?

Which of the following is formed in RBCs when CO2 combines with H2O in presence of carbonic anhydrase?

Identify the role of NAD+ in cellular respiration

____________ in mammals do not help in respiration.

When you hold your breath, identify the gas changes that occur in blood and would first lead to the urge to breathe.

Whenever we feel drowsy or sleepy, we start yawning. Does yawning help us in any way?

Observe the figures given in Figures 10.3 (A) and (B) and answer the following.

Which of the figures A or B indicates the process of inhalation and which is the process of exhalation?

Observe the figures given in Figures 10.3 (A) and (B) and answer the following.

In the figure label the arrows and indicate the direction of

  1. movement of air
  2. movement of the diaphragm
  3. movement of ribs

Assertion: During inhalation, the diaphragm goes downward.
Reason: The volume of the thoracic cavity decreases.

Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because ______.   

During inspiration, air passes into lungs due to

The partial pressures (in mm Hg) of oxygen (O2) and carbon dioxide (CO2) at alveoli (the site of diffusion) are ______

What is Dead Space?

Identify the wrong statement with reference to the transport of oxygen.

In Hamburger’s phenomenon, ______.

In HMP shunt, number of molecules of CO2 evolved are ______.

The figure given below shows a small part of human lung where exchange of gas takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function.

Interpret the given diagrams A and B. Enlist the changes occuring, during inspiration and expiration.


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