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[A]: Lymphocytes develop in lymphoid tis...

[A]: Lymphocytes develop in lymphoid tissue and involved in cell mediated and humeral immunity.
[R]: Lymphocytes are produced in primary lymphoid tissue (thymus, embryonic liver and adult bone narrow) and migrate to secondary lymphoid tissue (spleen and lymphnodes)

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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A
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Assertion. Lymphocytes arise from the stem cells present in the bone marrow and occur in the blood, lymph and connective tissues. Reason. Lymphocytes migrate to bursal lymphoid tissue or to thymus and differentiate into B or T-cells.

Assertion : The priamary lymphoid organs are bone marrow and tonsils. Reason : Secondary lymphoid organs are spleen , lymphnodes thymus Peyer's patches of small intestine and appendix.

[A] : Lymphocytes arise from bone marrow and present in the blood, lymph and connec- tive tissues. [R]: Lymphocytes migrate to thymus. where they develop into T cells and begin to mature.

Assertion : MALT constitutes about fifteen per cent of the lymphoid tissue in human body. Reason : The bone marrow is the main lymphoid orgain where all bllod cells excluding lymphocytes are produced.

(a) Name the lymphoid organ in humans where all the blood cells are produced. (b) Where do the lymphocytes produced by the lymphoid organ mentioned above migrate and how do they affect immunity?

Read the statements. (i) IgE antibodies are produced in an allergic reaction. (ii) B-lymphocytes mediate immunity. (iii) The yellowish fluid colostrum has abundant IgE antibodies. (iv) Spleen is a secondary lymphoid organ. Of the above statements:

Read the statement and find the correct ones 1. IgE antibodies are produced in an allergic reaction 2. B-lymphocytes mediate cell mediated immunity 3. The yellow fluid colostrum has abundant IgE antibodies 4. spleen is a secondary lymphoid organ

Which of these statements is/are correct w.r.t. MALT? a. Constitutes about 2/3rd part of the lymphoid tissue in human body. Br b. Associated with the mucus lining of digestive, respiratory and urogenital tracts. Br c. Site for interaction of lymphocytes with the antigen. d. Cells like B and Lymphocytes migrate here after maturation. It ishfecondary lymphoid tissue

[A] : Macrophage is a large amoeboid cell that can engulf, ingest and destroy bacteria, dam- aged cells and worn-out red blood cells. This process is called phagocytosis and is an im- portant part of the body s defence against disease. [R]: Macrophages are found free (wandering) in the tissues, in connective tissue) as histio- cytes), in the lining of the blood sinusoids of the liver (as Kupffer cells), and in lymphoid tissue. They make up the reticulo-endothelial system.

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