Oxygen Dissociation Curve & Its Sigmoidal Pattern — NEET Biology
📚 Practice ConceptDefine oxygen dissociation curve. Can you suggest any reason for its sigmoidal pattern?
Assertion (A): Environmental conditions affect haemoglobin’s affinity for oxygen. Reason (R): In tissues, low pO2 and high pCO2 conditions favour dissociation of oxygen from oxyhaemoglobin.
View solution & NCERT explanation
Correct answer: A — If both assertion and reason are true and the reason is the correct explanation of the assertion.
NCERT confirms environmental factors affect oxygen binding - Assertion is true. NCERT states “in the tissues, where low pO2, high pCO2, high H+ concentration and higher temperature exist, the conditions are favourable for dissociation of oxygen from the oxyhaemoglobin.” Reason correctly explains HOW tissue conditions cause oxygen release from haemoglobin, providing the mechanistic basis for the Assertion.
What does NCERT say about Define oxygen dissociation curve?
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Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.