2018 source guide · Biology

NEET 2018 Biology Human Physiology Questions

Connect the official 2018 paper with current Biology practice without labelling original previews as PYQs.
Practice 1150 verified questions →Check official NTA archive ↗
1150 original questions · explicit provenance labels
BiologyPlate 73
NeetVellum atlas · fig. biology
73

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

An Rh negative woman married to an Rh positive man delivers her first child without complications, but during a later pregnancy the foetus develops severe haemolysis. The underlying cause of this condition is:

  • A. ABO blood group mismatch between the mother and the foetus
  • B. Anti-Rh antibodies formed by the mother during the first pregnancy entering the foetus in the next pregnancy
  • C. Rh antigens of the mother attacking antibodies inherited by the foetus from the father
  • D. Maternal vitamin B12 deficiency leading to abnormal erythropoiesis in the foetus

Example 2 · difficulty 1/5

The human trachea is held open by C-shaped cartilaginous rings that are incomplete dorsally. The most appropriate reason for this incomplete (C-shaped) arrangement is that it:

  • A. allows the ciliated epithelium to beat freely over the entire circumference
  • B. permits the trachea to collapse completely during forced expiration
  • C. keeps the airway patent while allowing the adjacent oesophagus to bulge during swallowing
  • D. enables the rings to secrete surfactant that lowers surface tension

Example 3 · difficulty 2/5

Alveolar air has a pO₂ of about 104 mm Hg, while the deoxygenated blood reaching the alveolar capillaries has a pO₂ of about 40 mm Hg. As a direct consequence of this gradient:

  • A. oxygen diffuses from the alveoli into the capillary blood until it equilibrates near 95 mm Hg
  • B. oxygen is pumped from the capillaries into the alveoli by active transport
  • C. carbon dioxide simultaneously diffuses from the alveoli into the blood
  • D. oxygen remains confined to the alveoli because the respiratory membrane is impermeable to gases

The evidence-first practice loop

  1. 1. Verify provenanceOfficial paper and final key before accepting a PYQ label.
  2. 2. Attempt closed-bookExpose the concept or execution gap before rereading.
  3. 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 2018 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 2018 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.

Built by NeetVellum · original practice, explicit provenance, no fabricated PYQ claims.
NEET 2018 Biology Human Physiology Questions · NeetVellum