2020 source guide · Biology

NEET 2020 Biology Human Physiology 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.

Practice 639 verified questions →Check official NTA archive ↗

What to master

integrated respiratory, circulatory, excretory, neural, endocrine and movement physiology.

Original practice preview

These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.

Example 1 · difficulty 3/5

Which statement regarding neural and chemical regulation of respiration in humans is correct?

A. The pneumotaxic centre in the pons can moderate the functioning of the respiratory rhythm centre located in the medulla oblongata
B. The respiratory rhythm centre lies in the cerebellum and generates the basic breathing rhythm
C. The chemosensitive area beside the rhythm centre is activated mainly by a fall in arterial pO₂
D. Receptors in the aortic arch and carotid artery respond exclusively to blood pH and ignore CO₂

Example 2 · difficulty 4/5

During transport, CO₂ is largely trapped as bicarbonate at the tissue level. Which sequence correctly describes what happens to this bicarbonate once the blood reaches the alveoli?

A. HCO₃⁻ keeps accumulating inside RBCs while chloride ions leave them
B. carbonic anhydrase converts more CO₂ into H₂CO₃, further acidifying the RBCs
C. HCO₃⁻ re-enters RBCs, combines with H⁺ to form H₂CO₃, which splits into CO₂ and H₂O, and the CO₂ diffuses into alveolar air
D. HCO₃⁻ binds directly to the globin chains of haemoglobin and is exhaled as carbaminohaemoglobin breaks down

Example 3 · difficulty 4/5

A chronic smoker shows permanent enlargement of air spaces due to destruction of alveolar walls, while a stone-crushing industry worker develops progressive fibrosis of lung tissue. The two diagnoses, respectively, are:

A. asthma and asbestosis
B. emphysema and silicosis
C. emphysema and asthma
D. silicosis and emphysema

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

Breathing and Exchange of Gases →Body Fluids and Circulation →Excretory Products and their Elimination →Locomotion and Movement →Neural Control and Coordination →Chemical Coordination and Integration →

Frequently asked questions

Are these official NEET 2020 Biology Human Physiology 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.