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NEET Exam  >  NEET Test  >  Biology Class 11  >  Test: Exchange & Transport of Gases-1 - NEET MCQ

Exchange & Transport of Gases-1 - Free MCQ Practice Test with solutions,


MCQ Practice Test & Solutions: Test: Exchange & Transport of Gases-1 (12 Questions)

You can prepare effectively for NEET Biology Class 11 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Exchange & Transport of Gases-1". These 12 questions have been designed by the experts with the latest curriculum of NEET 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 12 minutes
  • - Number of Questions: 12

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Test: Exchange & Transport of Gases-1 - Question 1
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Vital capacity of our lungs include all of the following except :

Detailed Solution: Question 1

Vital capacity includes ERV, TV and IRV or the maximum volume of air a person can breathe out after a forced inspiration.

Topic in NCERT: Respiratory Volumes and Capacities

Line in NCERT: "Vital Capacity (VC): The maximum volume of air a person can breathe in after a forced expiration. This includes ERV, TV and IRV or the maximum volume of air a person can breathe out after a forced inspiration."

Test: Exchange & Transport of Gases-1 - Question 2
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Read the following statements :
i. Every 100 ml of deoxygenated blood delivers about 4 ml of CO2 to the alveoli.
ii. 20%-25% of CO2 is transported to the alveoli as carbamino-haemoglobin.
iii. RBCs contain a very high concentration of the enzyme carbonic anhydrase and minute quantities of the same are present in the plasma.

Detailed Solution: Question 2

Option D is correct.

Statement (i) is correct because the typical CO2 content of mixed venous blood is about 52 ml per 100 ml and that of arterial blood is about 48 ml per 100 ml, so the difference (amount delivered to the alveoli) is approximately 4 ml CO2 per 100 ml of blood.

Statement (ii) is correct: about 20-25% of the total CO2 carried in blood is bound to haemoglobin as carbamino-haemoglobin, while the remainder is mainly as bicarbonate ions and a small fraction is dissolved.

Statement (iii) is correct: red blood cells contain a very high concentration of the enzyme carbonic anhydrase, which catalyses the reversible conversion of CO2 and H2O to carbonic acid; only minute amounts of this enzyme are present in the plasma.

Because statements (i), (ii) and (iii) are all correct, the correct choice is 4 (all are correct), i.e., Option D.

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Test: Exchange & Transport of Gases-1 - Question 3
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The condition favourable for dissociation of oxygen from oxyhaemoglobin in the tissues is

Detailed Solution: Question 3

in the tissues, where low pO2 , high pCO2 , high H+ concentration and higher temperature exist, the conditions are favourable for dissociation of oxygen from the oxyhaemoglobin.

Topic in NCERT: Transport of Oxygen

Line in NCERT: "where low pO2, high pCO2, high H+ concentration and higher temperature exist, the conditions are favourable for dissociation of oxygen from the oxyhaemoglobin."

Test: Exchange & Transport of Gases-1 - Question 4
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Pharynx is the common passage for food and air but still food do not enter into the windpipe due to the presence of

Detailed Solution: Question 4

Epiglottis to prevent the entry of food into the larynx.

Topic in NCERT: Human Respiratory System

Line in NCERT: "During swallowing glottis can be covered by a thin elastic cartilaginous flap called epiglottis to prevent the entry of food into the larynx."

Test: Exchange & Transport of Gases-1 - Question 5
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The solubility of carbon dioxide is

Detailed Solution: Question 5

The solubility of carbon dioxide is 20-25 times higher than that of oxygen, the amount of carbon dioxide that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of oxygen.

Topic in NCERT: Gas Exchange and Diffusion

Line in NCERT: "As the solubility of CO2 is 20-25 times higher than that of O2, the amount of CO2 that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of O2."

Test: Exchange & Transport of Gases-1 - Question 6
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Which of the statements given above is/are correct about the process of respiration?

i. Breathing involves the exchange of atmospheric air and CO2-rich alveolar air.

ii. Oxygen and carbon dioxide diffuse across the alveolar membrane during respiration.

iii. Blood transports only carbon dioxide from tissues to the lungs.

iv. Cells utilize oxygen for anabolic reactions, releasing carbon dioxide as a byproduct.

Detailed Solution: Question 6

  • Statement i is correct because it describes the basic function of breathing, which includes taking in oxygen from the atmosphere and expelling carbon dioxide from the alveoli.
  • Statement ii is also correct as it highlights the diffusion of gases (O2 and CO2) across the alveolar membrane, which is a critical step in the respiratory process.
  • Statement iii is incorrect because blood transports both oxygen from the lungs to the tissues and carbon dioxide from the tissues back to the lungs.
  • Statement iv is incorrect because cells utilize oxygen primarily for catabolic reactions (energy production), which results in the release of carbon dioxide, not for anabolic reactions.

Therefore, the correct statements are i and ii, making Option D (i, ii, and iv) the right answer.

Topic in NCERT: RESPIRATION

Line in NCERT: "Respiration involves the following steps: (i) Breathing or pulmonary ventilation by which atmospheric air is drawn in and CO2 rich alveolar air is released out. (ii) Diffusion of gases (O2 and CO2) across alveolar membrane."

Test: Exchange & Transport of Gases-1 - Question 7
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Which of the statements given above is/are correct regarding the diffusion membrane?

i. The diffusion membrane consists of three major layers: the thin squamous epithelium of alveoli, the endothelium of alveolar capillaries, and the basement substance.

ii. The total thickness of the diffusion membrane is more than one millimeter.

iii. The diffusion of O2 from alveoli to tissues is facilitated by the favorable conditions in the body.

iv. CO2 diffuses from tissues to alveoli through a thicker membrane compared to O2 diffusion.

Detailed Solution: Question 7

To determine the correct statements, let's analyze each:

- Statement i is correct as it accurately describes the composition of the diffusion membrane, which includes the thin squamous epithelium of alveoli, the endothelium of capillaries, and the basement substance.

- Statement ii is incorrect. The total thickness of the diffusion membrane is much less than a millimeter, which contradicts the statement.

- Statement iii is correct because it aligns with the physiological principle that the conditions in the body promote the diffusion of oxygen (O2) from the alveoli to the tissues.

- Statement iv is incorrect as it misrepresents the diffusion process; CO2 diffuses through a similarly thin membrane, not a thicker one.

Thus, the correct answer is Option A: i and iii.

Topic in NCERT: Diffusion of Gases in the Alveoli

Line in NCERT: "The diffusion membrane is made up of three major layers namely, the thin squamous epithelium of alveoli, the endothelium of alveolar capillaries and the basement substance (composed of a thin basement membrane supporting the squamous epithelium and the basement membrane surrounding the single layer endothelial cells of capillaries) in between them."

Test: Exchange & Transport of Gases-1 - Question 8
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Assertion (A): Approximately 97 percent of oxygen in the blood is transported by red blood cells (RBCs).

Reason (R): The majority of carbon dioxide in the blood is carried as bicarbonate ions rather than dissolved in plasma.

Detailed Solution: Question 8

- The Assertion is true: Approximately 97 percent of oxygen is indeed transported by RBCs, which contain hemoglobin that binds oxygen effectively.

- The Reason is also true: A significant portion of carbon dioxide (about 70 percent) is carried in the blood as bicarbonate ions, which is a critical aspect of carbon dioxide transport.

- However, the Reason does not explain the Assertion directly. The transport mechanisms for oxygen and carbon dioxide are distinct, and one does not clarify the other. Thus, the correct answer is Option B.

Topic in NCERT: Transport of Gases

Line in NCERT: "About 97 per cent of O2 is transported by RBCs in the blood. The remaining 3 per cent of O2 is carried in a dissolved state through the plasma. Nearly 20-25 per cent of CO2 is transported by RBCs whereas 70 per cent of it is carried as bicarbonate."

Test: Exchange & Transport of Gases-1 - Question 9
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Which of the statements given above is/are correct?

i. The respiratory rhythm centre is primarily located in the medulla region of the brain.

ii. The pneumotaxic centre, found in the pons, enhances the duration of inspiration.

iii. Chemosensitive areas respond to increases in CO2 and hydrogen ions to regulate breathing.

iv. Oxygen plays a significant role in the regulation of respiratory rhythm.

Detailed Solution: Question 9

- Statement i is correct because the respiratory rhythm centre is indeed located in the medulla region of the brain, which is responsible for the basic rhythm of breathing.

- Statement ii is incorrect; the pneumotaxic centre moderates the functions of the respiratory rhythm centre by reducing the duration of inspiration, not enhancing it.

- Statement iii is correct as the chemosensitive area near the rhythm centre responds to elevated levels of CO2 and hydrogen ions, leading to adjustments in the respiratory process.

- Statement iv is incorrect; the text states that the role of oxygen in regulating respiratory rhythm is quite insignificant.

Thus, the correct statements are i and iii, making Option A the right answer.

Topic in NCERT: REGULATION OF RESPIRATION

Line in NCERT: "Respiratory rhythm is maintained by the respiratory centre in the medulla region of brain. A pneumotaxic centre in the pons region of the brain and a chemosensitive area in the medulla can alter respiratory mechanism."

Test: Exchange & Transport of Gases-1 - Question 10
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Which of the statements given above is/are correct?

i. Tidal Volume (TV) is approximately 500 mL and is the volume of air inspired or expired during a normal respiration.

ii. Residual Volume (RV) is the total volume of air that can be forcibly expired after a normal expiration.

iii. Vital Capacity (VC) includes Tidal Volume (TV), Inspiratory Reserve Volume (IRV), and Expiratory Reserve Volume (ERV).

iv. Functional Residual Capacity (FRC) is the volume of air that remains in the lungs after a maximum inspiration.

Detailed Solution: Question 10

- Statement i is correct: Tidal Volume (TV) is indeed approximately 500 mL and represents the volume of air exchanged during normal breathing.

- Statement ii is incorrect: Residual Volume (RV) is the volume of air that remains in the lungs after a forcible expiration, not the volume that can be forcibly expired.

- Statement iii is correct: Vital Capacity (VC) is the maximum volume of air a person can breathe out after a forced inspiration and does include TV, IRV, and ERV.

- Statement iv is incorrect: Functional Residual Capacity (FRC) is the volume of air remaining in the lungs after a normal expiration and includes ERV and RV, not the volume after maximum inspiration.

Thus, the correct statements are i and iii, leading to the correct answer being Option A.

Topic in NCERT: Respiratory Volumes and Capacities

Line in NCERT: "Tidal Volume (TV): Volume of air inspired or expired during a normal respiration. It is approx. 500 mL." "Residual Volume (RV): Volume of air remaining in the lungs even after a forcible expiration." "Vital Capacity (VC): The maximum volume of air a person can breathe in after a forced expiration. This includes ERV, TV and IRV." "Functional Residual Capacity (FRC): Volume of air that will remain in the lungs after a normal expiration."

Test: Exchange & Transport of Gases-1 - Question 11
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Assertion (A): Alveoli play a crucial role in the exchange of oxygen and carbon dioxide in the lungs.

Reason (R):
The efficiency of gas exchange in alveoli is influenced by the thickness of the alveolar membrane.

Detailed Solution: Question 11

  • Assertion (A) is true because alveoli are indeed the primary sites for gas exchange in the respiratory system, facilitating the transfer of oxygen into the blood and the removal of carbon dioxide.
  • Reason (R) is also true; the thickness of the alveolar membrane affects diffusion rates, with thinner membranes generally allowing for more efficient gas exchange.
  • Furthermore, the reason correctly explains the assertion, as a thinner alveolar membrane enhances the efficiency of gas exchange, thereby supporting the assertion about the role of alveoli.

Topic in NCERT: Gas Exchange and Diffusion Factors

Line in NCERT: "Rate of diffusion is dependent on the partial pressure gradients of O2 (pO2) and CO2 (pCO2), their solubility as well as the thickness of the diffusion surface."

Test: Exchange & Transport of Gases-1 - Question 12
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What anatomical structure forms the ventral boundary of the thoracic chamber?

Detailed Solution: Question 12

The sternum forms the ventral boundary of the thoracic chamber, providing structural support and protection for the organs within.

Topic in NCERT: THORACIC CHAMBER

Line in NCERT: "The thoracic chamber is formed dorsally by the vertebral column, ventrally by the sternum, laterally by the ribs and on the lower side by the dome-shaped diaphragm."

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This test contains 12 MCQs on Exchange & Transport of Gases-1 with detailed solutions for each question. It is part of the Biology Class 11 course on EduRev, designed to align with the current NEET syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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