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Which of the following best describes the shape of the oxygen‑hemoglobin dissociation curve?

easy MCQ 2 marks Class 11 · Biology · Breathing and Exchange of Gases
  1. Linear
  2. Hyperbolic
  3. Sigmoid (S‑shaped)
  4. Exponential
Answer
Sigmoid (S‑shaped).

The correct answer is Sigmoid (S‑shaped). — 3. Hence the correct description is a sigmoid shape.

Step-by-step solution

  1. 1. The curve shows the relationship between % saturation of hemoglobin and partial pressure of oxygen.
  2. 2. The curve rises steeply after a critical P_O2 and then flattens, forming an S shape.
  3. 3. Hence the correct description is a sigmoid shape.
Common mistake: Confusing it with a linear relationship

Concept tested: Shape of O2‑Hb curve

Published · How this solution was prepared and checked

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