Blood Composition · NCERT Biology

Which of the following describes the shape of a mature human erythrocyte?

  1. Nucleated and spherical in shape
  2. Non-nucleated and biconcave
  3. Nucleated and biconvex in shape
  4. Non-nucleated and irregularly shaped
Show answer and explanation

Correct answer: Non-nucleated and biconcave

Mature human RBCs lack a nucleus to provide more space for hemoglobin. Their biconcave shape increases the surface area-to-volume ratio, facilitating efficient gas exchange.

Difficulty: Medium Question 5 of 20

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