Select the incorrect statements from the following.
(a) An increase in temperature facilitates the release of oxygen from haemoglobin.
(b) Increased acidity increases the hemoglobin's affinity for oxygen.
(c) The binding of oxygen to haemoglobin is not affected by the partial pressure of carbon dioxide.
(d) An increase in the partial pressure of oxygen promotes the binding of oxygen to haemoglobin.

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(a) and (b)

(b) and (c)

(a) and (d)

answer is C.

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Detailed Solution

Partial pressure of carbon dioxide does affect the binding of oxygen to hemoglobin. As per the Bohr effect, an increase in the partial pressure of carbon dioxide (pCO₂) or acidity (decrease in pH) decreases the affinity of hemoglobin for oxygen, promoting the release of oxygen to tissues.

Increased acidity (decreased pH) decreases hemoglobin's affinity for oxygen, rather than increasing it. This phenomenon, known as the Bohr effect, facilitates the release of oxygen from hemoglobin in tissues where oxygen is needed the most.

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