65.

Which of the following statement is correct?

(a) Tracheal rings are of hyaline cartilage .

(b) Dorsal side of thoracic chamber is formed by sternum.

(d) All of the above

... Answer is A)
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66.

Which of the following statement is incorrect?

(a) Diffusion membrane is made up of 3-major layers.

(b) Solubility of CO2 is higher than O2 by 25 times.

(d) High conc. of hydrogen ions favours oxyhaemoglobin formation

... Answer is D)
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67.

With reference to human respiration, which is correct?

(a) Pulmonary ventilation is equal to alveolar ventilation.

(b) Alveolar ventilation is more than pulmonary ventilation.

(d) Pulmonary ventilation is less than alveolar ventilation.

✔️varified

... Answer is C)

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68.

Which of the following statement correctly defines Bohr effect?

(a) Rise in p50 with a decrease in CO2 conc. (b) Rise in p50 with decrease in pH. (c) Rise in p50 with increase in O2 . (d) Fall in p50 with decrease in pH.

... Answer is B)
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69.

Which of the following statement correctly defines "Bohr effect"?

Rise in P $_{C O_{2}}$ with a decrease in CO $_{2}$ concentration

Rise in P $_{C O_{2}}$ with an increase in CO $_{2}$ concentration

Rise in P $_{C O_{2}}$ with an increase in CO $_{2}$ and decrease in P $_{O_{2}}$

Rise in P $_{C O_{2}}$ with a decrease in pH (concentration at which 50% haemoglobin of blood is saturated with oxygen)

... Answer is D)
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70.

Which one of the following statement is correct?

(a) All animals require a medium for cellular respiration. (b) In all animals oxygen is transported by blood. (c) All animals need oxygen for respiration. (d) All of the above

... Answer is A)
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71.

Identify the correct statement with reference to transport of respiratory gases by blood ?

(a) Haemoglobin is necessary for transport of carbon dioxide and carbonic anhydrase for transport of oxygen.

(b) Haemoglobin is necessary for transport of oxygen and carbonic anhydrase for transport of carbon dioxide.

(d) Only carbon dioxide is transported by blood.

... Answer is B)
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65-

(a) Trachea is a membranous tube supported by “C” shaped hyaline cartilage ring. The cartilage ring protects the trachea from collapse and injury

66-(d) Oxyhaemoglobin is the bright red product which is formed when oxygen from the lungs combines with haemoglobin in the blood. It travels through the bloodstream to cells, where it breaks down to form haemoglobin and oxygen, and the oxygen then passes into cells. Factors like high pO2 , low pCO2 , lesser H+ concentration, and lower temperature favours for the formation of oxyhaemoglobin.

67-(c) ✔️varifiedAlveolar ventilation is less than pulmonary ventilation.

68-(b) Rise in p50 with decrease in pH is related to Bohr effect. Bohr effect is a physiological phenomenon first described in 1904 by the Danish physiologist Christian Bohr. This effect states that haemoglobin's oxygen binding affinity is inversely related both to acidity and to the concentration of carbon dioxide.

69-Correct option is

Rise in P $_{C O_{2}}$ with a decrease in pH (concentration at which 50% haemoglobin of blood is saturated with oxygen)

Bohr effect is the physiological process which demonstrates that oxygen binding affinity is inversely related to the low pH and concentration of carbon dioxide. If pH is lower than normal (normal physiological pH is 7.4), then Hb does not bind oxygen as well. As the amount of carbon dioxide increases, more $H^{+}$ are formed and the pH will decrease. Thus, a lower pH in the blood is suggestive of an increased carbon dioxide concentration, which in turn is due to a more active tissue that requires more oxygen.

70-

(a) All animals require a medium for cellular respiration. Cellular respiration is the process of oxidizing food molecules, like glucose, to carbon dioxide and water. The energy released is trapped in the form of ATP for use by all the energy-consuming activities of the cell.

71-

(b) Haemoglobin is an iron-containing protein in red blood cells that is responsible for transporting oxygen to the tissues and removing carbon dioxide from them. Carbonic anhydrase helps in transport of carbon dioxide.

The reaction that shows the catalyzation of carbonic anhydrase in our tissues is:

CO₂ + H₂O

\longrightarrow

H
2CO
3

\longrightarrow

H⁺ + HCO−
3

The catalyzation of carbonic anhydrase in the lungs is shown by:

H⁺ + HCO−
3

\longrightarrow

H
2CO
3

\longrightarrow

CO₂ + H₂O

The reason for the reactions being in opposite directions for the tissues and lungs is because of the different pH levels found in them. Without the carbonic anhydrase catalyst, the reaction is very slow, however with the catalyst the reaction is 10⁷ times faster.

The reaction catalyzed by carbonic anhydrase is:

HCO−
3 + H⁺

{\ce {<=>>}}

CO₂ + H₂O

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Breathing and Exchange of Gases | MCQs | STATEMENT TYPE QUESTIONS | NEET(Que 65-80 of 100)

Which of the following statement correctly defines "Bohr effect"?

Rise in P $_{C O_{2}}$ with a decrease in CO $_{2}$ concentration

Rise in P $_{C O_{2}}$ with an increase in CO $_{2}$ concentration

Rise in P $_{C O_{2}}$ with an increase in CO $_{2}$ and decrease in P $_{O_{2}}$

Rise in P $_{C O_{2}}$ with a decrease in pH (concentration at which 50% haemoglobin of blood is saturated with oxygen)

Section showing-View Explanation with NCERT Reference below all the questions.

Rise in P $_{C O_{2}}$ with a decrease in pH (concentration at which 50% haemoglobin of blood is saturated with oxygen)

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Breathing and Exchange of Gases | MCQs | STATEMENT TYPE QUESTIONS | NEET(Que 65-80 of 100)

Which of the following statement correctly defines "Bohr effect"?

Rise in PCO2​​ with a decrease in CO2​ concentration

Rise in PCO2​​ with an increase in CO2​ concentration

Rise in PCO2​​ with an increase in CO2​ and decrease in PO2​​

Rise in PCO2​​ with a decrease in pH (concentration at which 50% haemoglobin of blood is saturated with oxygen)

Section showing-View Explanation with NCERT Reference below all the questions.

Rise in PCO2​​ with a decrease in pH (concentration at which 50% haemoglobin of blood is saturated with oxygen)

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