The blood group O contains __ antibodies.
Stem
Bark
Cuticle
Cell wall
Which of the following statement is incorrect ? (a) A person of 'O' blood group has anti 'A' and anti 'B' antibodies in his blood plasma. (b) A person of 'B' blood group can't donate blood to a person of 'A' group (c) Blood group is designated on the basis of the presence of antibodies in the blood plasma.