Agglutination occurs in blood present in a test tube. This indicates:
1. Antibodies are present in plasma
2. Antigens are present on R.B.C.
3. Antigens are present in plasma
4. Antibodies are present on R.B.C
In the ABO system of blood groups, if both antigens are present but no antibody, the blood group of the individual would be:
1. O
2. AB
3. A
4. B