Define oxygen dissociation curve. Can yo | Class 11 Biology Chapter Breathing and Exchange of Gasses, Breathing and Exchange of Gasses NCERT Solutions

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Academic session 2026-27, Chapter 14 in the current curriculum.

Welcome to the NCERT Solutions for Class 11 Biology - Chapter Breathing and Exchange of Gasses. This page offers a step-by-step solution to the specific question from Exercise 1, Question 11:

Define oxygen dissociation curve. Can you suggest any reason for its sigmoidal pattern?

. With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 11:

Define oxygen dissociation curve. Can you suggest any reason for its sigmoidal pattern?

Answer:

The oxygen dissociation curve is a graph showing the percentage saturation of oxyhaemoglobin at various partial pressures of oxygen.

 

The curve shows the equilibrium of oxyhaemoglobin and haemoglobin at various partial pressures.

 

In the lungs, the partial pressure of oxygen is high. Hence, haemoglobin binds to oxygen and forms oxyhaemoglobin.

 

Tissues have a low oxygen concentration. Therefore, at the tissues, oxyhaemoglobin releases oxygen to form haemoglobin.

 

The sigmoid shape of the dissociation curve is because of the co-operative binding of oxygen to haemoglobin. As the first oxygen molecule binds to haemoglobin, it increases the affinity for the second molecule of oxygen to bind. Subsequently, haemoglobin attracts more oxygen.Hence Haemoglobin is a positively co-operative protein.

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NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

  • Read the question carefully and focus on the core concept being asked.
  • Reference examples and data from the chapter when answering questions about Breathing and Exchange of Gasses.
  • Review previous year question papers to get an idea of how such questions may be framed in exams.
  • Practice answering questions within the time limit to improve your speed and accuracy.
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Comments

  • Pooja
  • Nov 22, 2021

Really appreciable

  • Pipin pradhan
  • Sep 05, 2019

Very useful,thanks

  • Kirti
  • May 20, 2019

Thanks

  • Devansh
  • Mar 26, 2019

Nice

  • Prikshit
  • Feb 07, 2019

Helpful

  • Jatanti
  • Feb 01, 2019

Give some short answer according to a11 class student because students are also child a little,cute and lovely child

  • Kashish
  • Jan 15, 2019

Nice answer

  • Ankita
  • Jan 15, 2019

Thnxxx fr ur crrct ans.

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Welcome to the NCERT Solutions for Class 11 Biology - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 11: Define oxygen dissociation curve. Can you suggest any reason for its sigmoidal pattern?....

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