Assertion :A rise in PC $O_{2}$ , H+ ions and temperature shifts the Hb $O_{2}$ dissociation curve to right. Reason: A rise in PC $O_{2}$ or fall in pH decreases oxygen affinity for haemoglobin.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
A shift to the right of oxygen dissociation curveIndicates dissociation of oxygen from haemoglobin, in thetissues, low p $O_{2}$ , high p $C O_{2}$ , high H+ concentration (low pH oracidity) and higher temperature favour dissociation of oxygenfrom the oxyhaemoglobin.

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