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Read the passage given below and answer the questions:The human immune system consists of lymphoid organs, tissues, cells and soluble molecules like a

Reading Comprehension

Read the passage given below and answer the questions:
The human immune system consists of lymphoid organs, tissues, cells and soluble molecules like antibodies. The immune system is unique in the sense that it recognises foreign antigens, responds to these and remembers them. The immune system also plays an important role in allergic reactions, auto-immune diseases and organ transplantation. Lymphoid organs are the organs where origin and/or maturation and proliferation of lymphocytes occur.

1) Question

Which of the following is a primary lymphoid organ?

Thymus

Peyer’s patches

Spleen

Lymph nodes

Solution

Correct option is A

The primary lymphoid organs are bone marrow and thymus where immature lymphocytes differentiate into antigen-sensitive lymphocytes.

2) Question

Peyer’s patches are found inside the________________

Large intestine

Stomach

Small intestine

Gall bladder

Solution

Correct option is C

Peyer’s patches are the secondary lymphoid organs and are found inside the small intestine.

3) Question

Which of the following provide micro-environments for the development and maturation of T-lymphocytes?

Bone marrow

Thymus

Lymph nodes

Both (A) and (B)

Solution

Correct option is D

Both bone-marrow and thymus provide micro-environments for the development and maturation of T-lymphocytes.

4) Question

Which of the following is a bean shaped organ?

Bone marrow

Spleen

Lymph nodes

Peyer’s patches

Solution

Correct option is B

The spleen is a large bean-shaped organ. It mainly contains lymphocytes and phagocytes. It acts as a filter of the blood by trapping blood-borne micro-organisms. Spleen also has a large reservoir of erythrocytes.

5) Question

Which of the following is located within the lining of the major tracts (respiratory, digestive and urogenital tracts)?

Peyer’s patches

Spleen

MALT

None of the above

Solution

Correct option is C

There is lymphoid tissue also located within the lining of the major tracts (respiratory, digestive and urogenital tracts) called mucosa-associated lymphoid tissue (MALT). It constitutes about 50% of the lymphoid tissue in human body.

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