Blood Composition · NCERT Biology

Erythropoiesis (formation of RBCs) in adults occurs in the:

  1. Spleen
  2. Red bone marrow
  3. Yellow bone marrow
  4. Thymus
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Correct answer: Red bone marrow

In adults, the red bone marrow is the primary site for the production of red blood cells. In the fetus, this process mainly occurs in the liver and spleen.

Difficulty: Medium Question 19 of 20

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