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CBSE Class 12-science Answered

(i)What would happen to immune system, if thymus gland is removed from the body of a person?   (ii)A person shows strong unusual hypersensitive reactions when exposed to certain substances present in the air, identify the condition. Name the cells responsible for such reactions. 
Asked by Topperlearning User | 11 Jun, 2014, 01:04: PM
answered-by-expert Expert Answer

(i) Thymus is the primary lymphoid organ. Immature lymphocytes differentiate into antigen-sensitive lymphocytes. If thymus gland is removed from the body of a person, his immune system becomes weak as a result the person’s body becomes prone to infectious diseases.

(ii) Unusual hypersensitive reactions form a condition called allergy. The cells responsible for such reactions are mast cells.

Answered by | 11 Jun, 2014, 03:04: PM
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