I. Increased partial pressure of O_{2}II. Inc | vedclass

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(D) The dissociation of oxyhaemoglobin is favoured by conditions such as low partial pressure of $O_{2}$,high partial pressure of $CO_{2}$,high concen

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Only $I$

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(D) The dissociation of oxyhaemoglobin is favoured by conditions such as low partial pressure of $O_{2}$,high partial pressure of $CO_{2}$,high concentration of $H^{+}$ ions (low $pH$),and high temperature.$I.$ Increased partial pressure of $O_{2}$ promotes the binding of oxygen to haemoglobin (formation of oxyhaemoglobin),not its dissociation.$II.$ Increased partial pressure of $CO_{2}$ promotes dissociation (Bohr effect).$III.$ Increased partial pressure of $H^{+}$ (lower $pH$) promotes dissociation.$IV.$ Decreased partial pressure of $O_{2}$ promotes dissociation.Therefore,only situation $I$ does not favour the dissociation of oxyhaemoglobin.

$I.$ Increased partial pressure of $O_{2}$
$II.$ Increased partial pressure of $CO_{2}$
$III.$ Increased partial pressure of $H^{+}$
$IV.$ Decreased partial pressure of $O_{2}$
All the above situations favour the dissociation of oxyhaemoglobin except:

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$I.$ Increased partial pressure of $O_{2}$$II.$ Increased partial pressure of $CO_{2}$$III.$ Increased partial pressure of $H^{+}$$IV.$ Decreased partial pressure of $O_{2}$All the above situations favour the dissociation of oxyhaemoglobin except: