2018 source guide · Biology

NEET 2018 Biology Chemical Coordination and Integration Questions

Connect the official 2018 paper with current Biology practice without labelling original previews as PYQs.
Practice 200 verified questions →Check official NTA archive ↗
200 original questions · explicit provenance labels
BiologyPlate 26
NeetVellum atlas · fig. biology
26

What to master

endocrine glands, hormones, feedback and common endocrine disorders.

Original practice preview

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

Example 1 · difficulty 4/5

When adrenaline binds to its receptor on a liver cell membrane, which sequence correctly represents the signal transduction events that follow?

  • A. Adenyl cyclase is activated first, after which the G-protein couples the receptor to the enzyme
  • B. Adrenaline diffuses into the nucleus and directly switches on the genes coding for glycogen-splitting enzymes
  • C. The receptor itself converts ATP to cyclic AMP without any G-protein participation
  • D. Hormone–receptor binding activates the G-protein, which turns on adenyl cyclase; ATP is converted to cAMP, and cAMP activates protein kinases that trigger glycogen breakdown

Example 2 · difficulty 3/5

Atrial natriuretic factor (ANF), released by the walls of the atria when blood volume and pressure rise, restores blood pressure towards normal mainly by:

  • A. Causing dilation of blood vessels and promoting excretion of sodium and water in urine
  • B. Stimulating the juxtaglomerular cells to secrete more renin
  • C. Enhancing reabsorption of sodium ions in the distal tubules
  • D. Promoting aldosterone secretion from the adrenal cortex

Example 3 · difficulty 1/5

Which feature most directly distinguishes an endocrine gland from an exocrine gland?

  • A. An endocrine gland lacks ducts and releases hormones into the blood or tissue fluid
  • B. An endocrine gland releases its secretion through a duct onto an epithelial surface
  • C. An endocrine gland always secretes digestive enzymes in large amounts
  • D. An endocrine gland acts only on cells immediately next to it

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

Chemical Coordination and Integration →

Frequently asked questions

Are these official NEET 2018 Biology Chemical Coordination and Integration 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 Chemical Coordination and Integration Questions · NeetVellum