Example 1 · difficulty 2/5
The double-layered pleura primarily:
- A. reduces friction during lung movement
- B. pumps air into bronchi
- C. secretes haemoglobin
- D. keeps alveolar PO₂ at zero
2020 source guide · Biology
NEET 2020 Biology Breathing and Exchange of Gases Questions
Use this page to connect the official 2020 paper with current Biology practice. NeetVellum does not claim a chapter appeared in that paper until the official question and final key have been mapped.
What to master
ventilation, gas exchange, transport and respiratory regulation.
Original practice preview
These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.
Example 2 · difficulty 2/5
During quiet inspiration, the diaphragm:
- A. relaxes and domes upward
- B. contracts and flattens
- C. does not move
- D. contracts and moves upward
Example 3 · difficulty 2/5
Quiet expiration is usually produced mainly by:
- A. active contraction of the diaphragm
- B. active transport of air
- C. relaxation of inspiratory muscles and elastic recoil
- D. closure of the glottis
The evidence-first practice loop
- 1. Verify provenanceOfficial paper and final key before accepting a PYQ label.
- 2. Attempt closed-bookExpose the concept or execution gap before rereading.
- 3. Repair and returnClassify the miss and re-practice after a delay.
Canonical chapter practice
Frequently asked questions
Are these official NEET 2020 Biology Breathing and Exchange of Gases PYQs?
No. The previews are original NeetVellum practice questions. A historical item receives a PYQ label only after its official paper and authoritative final answer key are attached. Use the official archive for the source paper.
How should I use the NEET 2020 paper?
Solve the official paper under its original timing, verify against the final key, classify every miss, and then use the linked current-syllabus practice bank to repair the exposed concept.