2021 source guide · Biology

NEET 2021 Biology Chemical Coordination and Integration Questions

Use this page to connect the official 2021 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 100 verified questions →Check official NTA archive ↗

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 3/5

In a sample of 120 cells, 50 have only membrane receptors for peptide hormone P, 30 have only intracellular receptors for steroid hormone S, 15 have both receptor types, and 25 have neither. If both hormones reach every cell, how many cells can respond directly to both P and S?

A. 25
B. 45
C. 65
D. 15

Example 2 · difficulty 2/5

Which statement correctly describes the relationship between the hypothalamus and the posterior pituitary?

A. Oxytocin and vasopressin are synthesised by hypothalamic neurons and released from the posterior pituitary
B. The posterior pituitary synthesises all hypothalamic releasing hormones and sends them to the anterior pituitary
C. The hypothalamus stores posterior-pituitary hormones but never releases them into blood
D. The posterior pituitary is an exocrine lobe that sends hormones through a duct

Example 3 · difficulty 3/5

Consider the statements: I. Only anatomically discrete endocrine glands can produce hormones. II. Organs such as the heart, kidney and gastrointestinal tract also contain hormone-producing cells. Which option is correct?

A. Only statement I is correct
B. Only statement II is correct
C. Both statements are correct
D. Neither statement is correct

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 2021 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 2021 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.