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Biology · 2022 · 3 marks
CBSE 2022 · Region 4 · Set 1 · Q11
(a) Explain the roles of (i) primary, and (ii) secondary lymphoid organs that are responsible for developing defence to combat the action of…
(a)
Explain the roles of (i) primary, and (ii) secondary lymphoid organs that are responsible for developing defence to combat the action of pathogens/foreign antigens which enter our body.
(b)
Doctors generally advise not to undergo surgery of tonsils. Why ?
Marking-scheme solution
(a) (i) Origin and /or Proliferation and maturation of lymphocytes / the immature lymphocytes differentiate into antigen sensitive lymphocytes/ provide micro environment for development and maturation of Tlymphocytes.
(ii) Traps the microorganisms (antigens) and activate the lymphocytes that then proliferate to become effector cells (cause immune response) / provides site for interaction of lymphocytes with antigens
(b) Tonsils are secondary lymphoid organs / trap the antigen (pathogen) which then activate the mature lymphoid organs to become effector cells/ provides site for interaction of lymphocytes with antigens
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CBSE Class 12 Biology past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.