The increase in pH of blood has ________ effect on the oxygen carrying capacity of haemogolobin?

Explanation

An increase in blood pH increases haemoglobin's affinity for oxygen, so its oxygen-carrying capacity rises. This is part of the Bohr effect, in which lower pH promotes oxygen unloading in active tissues and higher pH favours oxygen binding. Students may choose negative because they remember that increased carbon dioxide lowers pH, but the question asks about the direct effect of increased pH.