Why is blood group identification not required while transfusing serum?
Ans15. The serum is a cell-free fluid, which forms when the blood has clotted and the thrombus has separated from it. Since the blood group deciding antigens reside on the RBCs which are not present in the serum, hence it can be transfused to anyone without the customary requirement of the blood group identification. Q16. The primitive earth had reducing atmosphere to enable abiotic origin of life. What put an end to it? Ans16. The emergence of green bacteria and plants with the ability to produce photosynthetic oxygen caused heavy build up of oxygen in the earths atmosphere, which caused the reducing environment to be changed into an oxidising environment. Q17. How a sickle-cell carrier has an advantage over the rest of the human population in a Malaria ridden area? Ans17. A defective form of haemoglobin is found in the RBCs of the Sickle-cell carrier. They have sickle-shaped RBCs, which are highly inefficient in binding oxygen. However, a sickle shaped RBC effectively kills the malar
