Mammalian blood Mcqs

1. What percentage of the blood does the fluid matrix called plasma constitute?

(A) 45 per cent

(B) 55 per cent

(D) 6-8 per cent

Answer

Answer: (B) 55 per cent

2. What is the primary constituent of plasma, making up 90-92 per cent of it?

(A) Proteins

(B) Formed elements

(D) Minerals

Answer

Answer: (C) Water

3. Which of the following major plasma proteins is primarily involved in the defense mechanisms of the body?

(A) Fibrinogen

(B) Globulin

(D) Haemoglobin

Answer

Answer: (B) Globulin

4. Plasma without the clotting factors is known as what?

(A) Lymph

(B) Tissue fluid

(D) Formed elements

Answer

Answer: (C) Serum

5. Erythrocytes, leucocytes, and platelets collectively constitute nearly what percentage of the blood?

(A) 45 per cent

(B) 55 per cent

(D) 90 per cent

Answer

Answer: (A) 45 per cent

6. What is the average number of RBCs per cubic millimeter of blood in a healthy adult man?

(A) 1.5 to 3.5 millions

(B) 5 to 5.5 millions

(D) 2.5 to 4.5 millions

Answer

Answer: (B) 5 to 5.5 millions

7. Where are Red Blood Cells (RBCs) formed in human adults?

(A) Spleen

(B) Liver

(D) Lymph nodes

Answer

Answer: (C) Red bone marrow

8. What is the average life span of RBCs before they are destroyed?

(A) 60 days

(B) 90 days

(D) 150 days

Answer

Answer: (C) 120 days

9. Which organ is commonly referred to as the ‘graveyard of RBCs’?

(A) Liver

(B) Kidney

(D) Spleen

Answer

Answer: (D) Spleen

10. How much haemoglobin is present in every 100 ml of blood in a healthy individual?

(A) 10-12 gms

(B) 12-16 gms

(D) 8-10 gms

Answer

Answer: (B) 12-16 gms

11. What is the average number of leucocytes (WBCs) per cubic millimeter of blood?

(A) 4000-6000

(B) 6000-8000

(D) 10000-12000

Answer

Answer: (B) 6000-8000

12. Which of the following leucocytes is classified as an agranulocyte?

(A) Neutrophil

(B) Eosinophil

(D) Monocyte

Answer

Answer: (D) Monocyte

13. Which type of white blood cell is the most abundant, making up 60-65 per cent of total WBCs?

(A) Lymphocytes

(B) Neutrophils

(D) Basophils

Answer

Answer: (B) Neutrophils

14. Which WBCs secrete histamine, serotonin, and heparin, and are involved in inflammatory reactions?

(A) Eosinophils

(B) Neutrophils

(D) Monocytes

Answer

Answer: (C) Basophils

15. Which white blood cells are primarily associated with resisting infections and allergic reactions?

(A) Eosinophils

(B) Basophils

(D) Neutrophils

Answer

Answer: (A) Eosinophils

16. Platelets, also called thrombocytes, are cell fragments produced from which special cells in the bone marrow?

(A) Erythrocytes

(B) Leucocytes

(D) Lymphocytes

Answer

Answer: (C) Megakaryocytes

17. What is the normal platelet count per cubic millimeter of blood?

(A) 1,500,00-3,500,00

(B) 6000-8000

(D) 50,000-100,000

Answer

Answer: (A) 1,500,00-3,500,00

18. ABO grouping is based on the presence or absence of two surface antigens on which component of blood?

(A) WBCs

(B) Platelets

(D) RBCs

Answer

Answer: (D) RBCs

19. Which blood group individuals have no A or B antigens on their RBCs?

(A) Blood group A

(B) Blood group B

(D) Blood group O

Answer

Answer: (D) Blood group O

20. Which blood group contains anti-A and anti-B antibodies in its plasma?

(A) A

(B) B

(D) O

Answer

Answer: (D) O

21. Individuals with which blood group are called ‘universal donors’?

(A) A

(B) B

(D) O

Answer

Answer: (D) O

22. Which blood group is considered a ‘universal recipient’ because it can accept blood from all other groups?

(A) A

(B) B

(D) O

Answer

Answer: (C) AB

23. The Rh antigen is observed on the surface of RBCs in nearly what percentage of humans?

(A) 55 per cent

(B) 80 per cent

(D) 45 per cent

Answer

Answer: (B) 80 per cent

24. Erythroblastosis foetalis can be observed in cases of Rh incompatibility between which two groups?

(A) Rh+ve mother and Rh-ve foetus

(B) Rh-ve mother and Rh+ve foetus

(D) Rh-ve mother and Rh-ve foetus

Answer

Answer: (B) Rh-ve mother and Rh+ve foetus

25. To prevent erythroblastosis foetalis, what is administered to the mother immediately after the delivery of the first child?

(A) Rh antigens

(B) Antibiotics

(D) Blood transfusion

Answer

Answer: (C) Anti-Rh antibodies

26. During blood coagulation, what forms a network of threads trapping dead and damaged formed elements?

(A) Thrombin

(B) Fibrins

(D) Fibrinogen

Answer

Answer: (B) Fibrins

27. Inactive fibrinogens in the plasma are converted to fibrins by which active enzyme?

(A) Thrombokinase

(B) Prothrombin

(D) Heparin

Answer

Answer: (C) Thrombin

28. Which enzyme complex is formed by a cascade process to convert prothrombin into thrombin?

(A) Fibrin

(B) Thrombokinase

(D) Albumin

Answer

Answer: (B) Thrombokinase

29. Which mineral ions play a very important role in blood clotting?

(A) Sodium ions

(B) Potassium ions

(D) Calcium ions

Answer

Answer: (D) Calcium ions

30. Which fluid released out of blood capillaries into tissue spaces has the same mineral distribution as plasma?

(A) Serum

(B) Intracellular fluid

(D) Formed elements

Answer

Answer: (C) Interstitial fluid