Question

Which of the following statements are wrong?
i. Leukocytes disintegrate in the spleen and liver.
ii. RBC, WBC and blood platelets are produced by bone marrow.
iii. Neutrophils bring about destruction and detoxification of toxins of protein origin.
iv. The Important function of lymphocytes is to produce antibodies.
A. (i) and (ii) only
B. (ii) and (iv) only
C. (i) and (iii) only
D. (ii) and (iii) only

Answer 1

Plasma, red and white blood cells, and platelets are the contents of blood. Approximately $55\%$ of blood fluid in humans is constituted by plasma. The remaining $45\%$ of the blood is constituted by red and white blood cells and platelets. Each one of these components has a vital role to play in keeping the functioning of the body effectively. Less than $1\%$ of blood content makes up the white blood cells.

Complete answer:
i. Leukocytes disintegrate in the spleen and liver: Leukocytes or the white blood cells, are a cellular component of the blood which lacks hemoglobin, has a nucleus and are capable of motility, these cells defend the body against infection and disease. Leucocytes disintegrate in blood, liver and lymph nodes. Hence (i) is a wrong statement.
ii. RBC, WBC and blood platelets are produced by bone marrow: The red blood cells or erythrocytes are formed in the red bone marrow of bones. White blood cells are also made in the bone marrow and are stored in blood and lymph tissues. Same as the red blood cells and most of the white blood cells, platelets are also produced in bone marrow. Hence (ii) is correct.
iii. Neutrophils bring about destruction and detoxification of toxins of protein origin: The neutrophils are phagocytic in nature, which means they engulf harmful germs and components. Neutrophils are the first to reach the site of infection. Hence option C is a wrong statement.
iv. The Important function of lymphocytes is to produce antibodies: One of the main types of immune cells are the lymphocytes. The lymphocytes are mainly divided into B and T cells. B lymphocytes and produce antibodies - proteins (gamma globulins) which recognize foreign substances (antigen) and attach themselves to them. Hence (iv) is a correct statement.
A. (i) and (ii) only: Here, (i) is wrong and (ii) is correct, hence option A is not the correct answer.
B. (ii) and (iv) only: Here, both (ii) and (iv) are correct. Hence option B is not the correct answer.

Therefore, option C. (i) and (iii) only: Both (i) and (iii) are wrong statements. Hence C is the correct answer.

D. (ii) and (iii) only: Here, (ii) is correct and (iii) is wrong. Hence option D is not the correct answer.

Note:
Based upon the antibodies and antigens in the cell, the blood groups are categorized. It can lead to fatal complications by receiving an incompatible blood donation. Anemia, blood cancer, and blood clots are all potential disorders of blood. Before entering the bloodstream, RBCs, white blood cells, and platelets are produced in the bone marrow.