Tag: cells of immune system

Questions Related to cells of immune system

Immature lymphocytes are

zoology immunity cells of immune system cells in immune system lymphocytes and lymph

  1. T-lymphocytes

  2. B-lymphocytes

  3. Thymocytes

  4. Leucocytes

Show answer
Correct Option: C
Explanation:

B-cells (or B-lymphocytes) and T-cells (or T-lymphocytes) are the lymphocytes, that are mature and have receptors on their surface and thus are able to bind to antigens and help the foreign substance to be removed from the body.
Thymocytes are the developing T-cells of hematopoietic origin and are immature.
Leukocytes are the mature white blood cells.
Thus, the correct answer is the option (C), 'Thymocytes'.

Agranulocytes normally develop in

zoology immunity cells of immune system cells in immune system lymphocytes and lymph

  1. Bone marrow

  2. Liver

  3. Lymph glands and spleen

  4. None of these

Show answer
Correct Option: C
Explanation:
The blood cells are of three major types they are erythrocytes(RBC), leucocytes(WBC) and platelets. Two main categories of WBCs are granulocytes and agranulocytes. Neutrophils, eosinophils, and basophils are different types of granulocytes, while lymphocytes and monocytes are the agranulocytes.  Lymphocytes are of two major types – ‘B’ and ‘T’ forms. Agranulocytes normally develop in lymph nodes and spleen.
So, the correct answer is 'Lymph glands and spleen'.

Acquired immunity is due to

zoology immunity cells of immune system cells in immune system lymphocytes and lymph

  1. Physiological and inflammatory barrier

  2. Lymphocytes

  3. Erythrocytes

  4. NK cells

Show answer
Correct Option: B
Explanation:

Acquired immunity is a type of immunity which is not present at birth. It is learned. As a person's immune system encounters various antigens, the components of acquired immunity find the best way to attack each antigen and begins to develop a memory for that antigen. It is also called specific immunity. Acquired immunity takes time to develop after initial exposure to a new antigen.
Lymphocytes are the type of white blood cell responsible for acquired immunity. Acquired immune response begins with antibodies, produced by B cells or B lymphocytes.
Thus, the correct answer is the option (D), 'Lymphocytes'.

Formation of antibodies is the function of

zoology immunity cells of immune system cells in immune system lymphocytes and lymph

  1. Monocytes

  2. Neutrophils

  3. Basophils

  4. Lymphocytes

Show answer
Correct Option: D
Explanation:

Lymphocytes are of two major types, ‘B’ and ‘T’ forms. When B lymphocytes recognize foreign antigen they release antibodies. The B cells are known as plasma cells. Hence the formation of antibodies is the function of lymphocytes.

So, the correct answer is 'Lymphocytes'.

Choose correct alternative in the following statements:
Function of WBCs is to

zoology immunity cells of immune system cells in immune system lymphocytes and lymph

  1. Transport oxygen

  2. Help in clotting of blood

  3. Provide immunity

  4. Provide storage of food

Show answer
Correct Option: C
Explanation:
White blood cells, also known as leucocytes are components of the formed elements of human blood. They are of two categories: agranulocytes and granulocytes. Their major function is to provide immunity.
So, the correct answer is, 'Provide immunity.'

Identify a function of lymphocytes from the following.

zoology immunity cells of immune system cells in immune system lymphocytes and lymph

  1. Destruction of poisonous substance

  2. Destruction of bacteria

  3. Destruction of RBC

  4. None of the above

Show answer
Correct Option: B
Explanation:

White blood cells are an important part of the immune system. Lymphocytes are one of several different types of white blood cells. Lymphocytes are of two types B cells and T cells. When a macrophage engulfs bacteria B cells release antibodies which cause the destruction of bacteria. The T cells destroy the infectious bacteria by killing the body cells that are affected.

So, the correct answer is 'Destruction of bacteria'.

Which of the following is a unit of immune system?

zoology immunity cells of immune system cells in immune system lymphocytes and lymph

  1. Lymphocytes

  2. Erythrocyte

  3. Chondrocytes

  4. Parasite

Show answer
Correct Option: A
Explanation:

Lymphocytes are one of several different types of white blood cells. Lymphocytes are of two types B cells and T cells. When a macrophage engulfs organisms, B cells (humoral immunity) release antibodies which cause the destruction of bacteria. The T cells (cell-mediated immunity) destroy the infectious organisms by killing the body cells that are affected. Hence lymphocytes is a unit of the immune system.

So, the correct answer is 'Lymphocytes'.

A liquid P, light yellow in colour, circulates in the human body only in one direction (from body tissues to the heart). P contains germs from cells and dead cells. P is cleaned of germs and dead cells by a special type of white blood cells called as

zoology immunity cells of immune system cells in immune system lymphocytes and lymph

  1. Lymphocytes

  2. Parasites

  3. Saprophytes

  4. Hermaphrodites

Show answer
Correct Option: A
Explanation:

The lymph fluid (P) inside the lymph nodes contains lymphocytes, a type of white blood cell, which continuously recirculates through the lymph nodes and the bloodstream. Molecules found on bacteria cell walls or chemical substances secreted from bacteria, called antigens, are taken up by antigen cells into the lymph system and then into lymph nodes. In response to the antigens, the lymphocytes in the lymph node make antibodies which will go out of the lymph node into circulation, target the pathogens producing the antigens by targeting them for destruction by other cells and complement.

Therefore, the correct answer is option A.

Which of the following statements are wrong?
(i) Leucocytes 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.

zoology immunity cells of immune system cells in immune system lymphocytes and lymph

  1. (i) and (ii) only

  2. (i) and (iv) only

  3. (i) and (iii) only

  4. (ii) and (iii) only

Show answer
Correct Option: C
Explanation:

The spleen acts to help keep the blood free of unwanted substances, including wastes and infecting organisms. The blood is delivered to it by the splenic artery and passes through smaller branch arteries into a network of channels lined with leukocytes, known as phagocytes. Red blood cells disintegrate in spleen. 

RBC, WBC and blood platelets are produced by hematopoietic stem cells present in bone marrow. 
Neutrophils are phagocytic cells that engulf the foreign particles. They are the first to reach the site of infection. 
B-lymphocytes produce antibodies against the infection or pathogen in human body. 

State the following statement True or False:


White blood cells are also called leukocytes.

zoology immunity cells of immune system cells in immune system lymphocytes and lymph

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

A) The statement is true as WBCs are called leukocytes because they are colorless and do not possess any pigments.

B) WBCs are called leukocytes.
So the correct answer is 'True'.