Tag: biology

Questions Related to biology

Which of the following blood cells help in blood coagulation?

biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

  1. RBCs

  2. Lymphocytes

  3. Thrombocytes

  4. Basophils

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Correct Option: C
Explanation:

Red blood cells or RBCs are the most common type of blood cell and contains hemoglobin, which is the principal means of delivering oxygen.
Lymphocyte is a type of white blood cell, that is important in the immune system.
Basophils are granulocytes i.e., they contain large cytoplasmic granules in the cell nucleus and it stores histamine (a vasodilator).
Thrombocyte is a platelet and is crucial for blood clotting.
Thus, the correct answer is option (C), 'Thrombocytes'.

Formation of platelets is known as

biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

  1. Haemopoiesis

  2. Thrombopoiesis

  3. Haemolysis

  4. None of the above

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Correct Option: B
Explanation:

Platelets or thrombocytes are cell fragments produced from megakaryocytes (special cells in the bone marrow). Formation of platelets by fragmentation of megakaryocytes in bone marrow is known as thrombopoiesis.

So, the correct answer is 'Thrombopoiesis'.

Blood platelets are present in the blood of

biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

  1. Fishes

  2. Amphibians

  3. Reptiles

  4. Mammals

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Correct Option: D
Explanation:

The blood cells are of three major types they are erythrocytes(RBC), leucocytes(WBC) and platelets. Platelets or thrombocytes are cell fragments produced from megakaryocytes (special cells in the bone marrow).Blood normally contains 1,500,00 - 3,500,00 platelets mm – 3. Platelets can release a variety of substances most of which are involved in the coagulation or clotting of blood.  Blood platelets are present in the blood of Mammals.

So, the correct answer is 'Mammals'.

Blood platelets are

biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

  1. Nucleated

  2. Nucleus is many lobed

  3. Nucleus is very small

  4. Denucleated

Show answer
Correct Option: D
Explanation:

The blood cells are of three major types they are erythrocytes(RBC), leucocytes(WBC) and platelets. Platelets or thrombocytes are cell fragments produced from megakaryocytes (special cells in the bone marrow). Formation of platelets by fragmentation of megakaryocytes in bone marrow is known as thrombopoiesis. As blood platelets are cell fragments they do not have any nucleus i.e Denucleated.

So, the correct answer is 'Denucleated'.

Haemorrhagic disorder occurs when the platelet count falls to less than ________________.

biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

  1. $1,50,000/mm^3$

  2. $1,00,000/mm^3$

  3. $75,000/mm^3$

  4. $50,000/mm^3$

Show answer
Correct Option: D
Explanation:

Hemorrhagic Disorders Spontaneous or near spontaneous bleeding caused by a defect in clotting mechanisms (blood coagulation disorders) or another abnormality causing a structural flaw in the blood vessels. Platelets play an important role in blood clotting, so thrombocytopenia puts you at higher risk of bleeding. Any time your platelet count drops below 50,000 per mm3 you are considered to be at increased risk for bleeding.


So, the correct answer is '50,000/mm3'.

Which of the following blood cells help in blood coagulation?

biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

  1. RBCs

  2. Lymphocytes

  3. Thrombocytes

  4. Basophils

Show answer
Correct Option: C
Explanation:

Thrombocytes are pieces of very large cells in the bone marrow called megakaryocytes. They help form blood clots to slow or stop bleeding and to help wounds heal.


So, the correct answer is 'Thrombocytes'.

What is correct about the statements?
Statement A. Blood sugar level falls rapidly after hepatectomy
Statement B. Glycogen of liver is principal source of blood sugar

biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

  1. Statement A and B correct with B being reason for A

  2. Statement A is correct but B is wrong

  3. Statement A is wrong but B is correct

  4. Both correct but B is not reason of A

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Correct Option: B

Thromboplastin is produced by

biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

  1. Damaged tissues

  2. Blood platelets

  3. Both blood platelets and damaged tissues

  4. Prothrombin.

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Correct Option: C

Blood platelets produce

biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

  1. Fibrinogen

  2. Thromboplastin

  3. Haemoglobin

  4. Calcium.

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Correct Option: B

Thrombocytes have a life of

biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

  1. 3-4 weeks

  2. 4-5 weeks

  3. 5-9 days

  4. None of the above.

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Correct Option: C