2018 source guide · Biology

NEET 2018 Biology Chemical Coordination and Integration Questions

Use this page to connect the official 2018 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.

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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. 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

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.