Breathing and Exchange of Gases — Important Questions
CBSE · Class 11 · Biology
101 important questions from Breathing and Exchange of Gases for CBSE Class 11 Biology, with answers. Part of the CBSE Class 11 Biology syllabus.
Interactive on Super Tutor
Studying Breathing and Exchange of Gases? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for important questions and more.
Free trial, no card needed.
Important Questions from Breathing and Exchange of Gases
How is most oxygen transported in the blood?
Show answer
Bound to red blood cells
About 97% of oxygen is transported by red blood cells bound to hemoglobin.
What muscle helps create pressure changes during breathing?
Show answer
The diaphragm
The diaphragm is the dome-shaped muscle that helps in changing the volume of the thoracic chamber during breathing. Its contraction increases thoracic volume and helps create the pressure difference needed for inspiration. The intercostal muscles also assist, but among the given options the diaphragm is the muscle responsible.
What is the main site of gas exchange in the lungs?
Show answer
Alveoli
Alveoli are thin, irregular-walled, vascularized structures where actual gas exchange occurs.
What percent of carbon dioxide is transported as bicarbonate?
Show answer
70%
Approximately 70% of carbon dioxide is transported as bicarbonate in the blood.
+97 more questions on Breathing and Exchange of Gases (CBSE Class 11 Biology)
Practise AllFrequently Asked Questions
What are the important topics in Breathing and Exchange of Gases for CBSE Class 11 Biology?
How many important questions are there in Breathing and Exchange of Gases?
Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Breathing and Exchange of Gases
Practice Quiz
Test yourself with a quick quiz
Revision Notes
Key points for last-minute revision
Formula Sheet
The chapter's formulas in one place
Chapter Summary
Understand the chapter at a glance
Concept Maps
See how topics connect
Study Plan
Step-by-step plan for this chapter
Flashcards
Quick-fire cards for active recall
Syllabus
What topics to cover
NCERT Solutions
Every textbook question solved step by step
For serious students
Get the full Breathing and Exchange of Gases chapter — start free.
Quizzes, flashcards, an AI doubt solver and a study plan for CBSE Class 11 Biology. Free to start, no card needed.