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Respiration Class 11th Biology | Practice MCQs with Answers for NEET

Q1. Which among the following does not exchange o2 with CO2 through simple diffusion

A) Earthworms
B) Earthworms
C) Sponges
D) Flatworms

Answer: (B) Earthworms

They use moist cuticle for exchange

Q2. Which among the following have well developed respiratory system

A) Cockroaches
B) Earthworms
C) Sponges
D) Mammals

Answer: (D) Mammals

Mammals well developed system includes lungs, alveoli, bronchi and bronchioles

Q3. How many lobes are present in right lung

A) 2
B) 5
C) 3
D) 4

Answer: (C) 3

Left lung is 2 lobed whereas right lung is 3 lobed

Q4. Name a sound box which is responsible for sound production

A) Pharynx
B) Larynx
C) Epiglottis
D) None of the above

Answer: (B) Larynx

Pharynx is common passage for food and air, epiglottis prevent entry of food into wind pipe

Q5. Thoracic chamber is dorsally formed by

A) Vertebral column
B) Sternum
C) Ribs
D) Diaphragm

Answer: (A) Vertebral column

Sternum is ventrally formed, ribs laterally and diaphragm on the lower side

Q6. Inspiration occurs if the pressure within the lungs is

A) More than atm pressure
B) Less tha atm pressure
C) Equal to atm pressure
D) None of the above

Answer: (B) Less tha atm pressure

If the pressure is more than expiration occurs

Q7. The part starting from external nostril upto terminal bronchioles is known as

A) Conducting part
B) Exchange part
C) Respiratory part
D) None of the above

Answer: (A) Conducting part

Alveoli and their ducts form exchange or the respiratory part

Q8. What is the structural and functional unit of lungs

A) Bronchioles
B) Alveoli
C) Bronchi
D) Both a and c

Answer: (B) Alveoli

Q9. On an average healthy human breathes how many times per minute

A) 12-16
B) 15-16
C) 20-25
D) 72

Answer: (A) 12-16

Q10. What is the inspiratory reserve volume

A) 2500-3000 ml
B) 500 ml
C) 1000-1100 ml
D) None of the above

Answer: (A) 2500-3000 ml

500ml is tidal volume, 1000-1100 ml is expiratory reserve volume

Q11. Volume air inspired or expired during normal respiration is known as

A) TV
B) IRV
C) ERV
D) RV

Answer: (A) TV

Q12. which among the following is measured by spirometer

A) Total lung capacity
B) FRC
C) RV
D) TV

Answer: (D) TV

Rest all aren?t measured by spirometer

Q13. Pressure contributed by an individual gas in a mixture of gas is known as

A) Partial pressure
B) Diffusion pressure
C) Osmotic pressure
D) None of the above

Answer: (A) Partial pressure

Partial pressure is exerted by individual gases

Q14. Solubility of CO2 is how many times higher than O2

A) 10-15
B) 30-40
C) 20-21
D) 20-25

Answer: (D) 20-25

Its 20-25 times higher

Q15. What is the partial pressure of O2 in atmosphere

A) 156
B) 159
C) 94
D) 40

Answer: (B) 159

O2 pressure is 159 and co2 is 0.3

Q16. What is the partial pressure of O2 in deoxygenated blood

A) 45
B) 40
C) 95
D) 43

Answer: (B) 40

C02 pressure in deoxy blood is 45

Q17. How many percent of co2 is carried by plasma in dissolved form

A) 6
B) 7
C) 20-25
D) None of the above

Answer: (B) 7

7 percent is carried by plasma

Q18. How many percent of co2 is carried as bicarbonate

A) 50
B) 97
C) 70
D) 25

Answer: (C) 70

Q19. Every 100ml of deoxy blood delivers approx

A) 2ml of co2 to alveoli
B) 3 of co2 to alveoli
C) 4ml of co2 to alveoli
D) 7ml of co2 to alveoli

Answer: (C) 4ml of co2 to alveoli

It delivers of 4ml of co2

Q20. RBC contains very high quantity of which enzyme

A) Carbonic anhydrase
B) Lysosome
C) Ligase
D) None of the above

Answer: (A) Carbonic anhydrase

Only carbonic anhydrase is present in RBC

Q21. which among the following is caused due to decreased respiratory surface area

A) Astma
B) Emphysema
C) Sclerosis
D) None of the above

Answer: (B) Emphysema

Astma occurs due to inflammation of bronchioles

Q22. Whose role in respiratory rhythm regulation is insignificant

A) Co2
B) O2
C) Both a and b
D) None of the above

Answer: (B) O2

Q23. Pneumotaxic centre is present in which region of brain

A) Medulla
B) Hypothalamus
C) Pons
D) None of the above

Answer: (C) Pons

Q24. Which type of curve is formed when percent of haemoglobin is plotted against po2

A) Straight line
B) Hyperbola
C) Sigmoid
D) Parabola

Answer: (C) Sigmoid

Sigmoid curve is obtained

Q25. which among the following is responsible to shift o2 dissociation curve right

A) High Pco2
B) Low pco2
C) Low H+
D) None of the above

Answer: (A) High Pco2

Option b and c shift the curve left

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