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
Connect the official 2020 paper with current Biology practice without labelling original previews as PYQs.
150 original questions · explicit provenance labels
BiologyPlate 86
NeetVellum atlas · fig. biology
86
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.