Biology
A man whose blood group is not known meet with a serious accident and needs blood transfusion immediately. Which one of the blood group mentioned below and readily available in the hospital will be safe for transfusion

AB, Rh-
O, Rh+
AB, Rh+
O, Rh-

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Biology
Which one of the following statements regarding haemoglobin is correct?

Haemoglobin is only used for blood clotting and not for carrying gases
Haemoglobin present in RBC can carry only oxygen but not carbon dioxide
Haemoglobin of RBC can carry only carbon dioxide
Haemoglobin of RBC can carry both oxygen and carbon dioxide

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