WAEC Biology 2021 Theory — Question 2
Question 2 of 26 from the West African Examinations Council (WAEC) Biology 2021 Theory paper, with the correct answer and a full explanation.
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1(b). Name the component of the blood that: (i) would form the top layer in the test tube; (ii) destroys pathogens; (iii) is biconcave in shape; (iv) would be relatively low in a haemophilic condition; (v) is produced in the bone marrow; (vi) is a thrombocyte; (vii) is nucleated.
Model answer
(i) Blood plasma. (ii) White blood cells. (iii) Red blood cells. (iv) Blood platelets. (v) Red blood cells (also produced in bone marrow along with white cells and platelets). (vi) Blood platelets. (vii) White blood cells.
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