Chemical Coordination & Integration - NEET Previous Year Questions with Complete Solutions

NEET typically sets 2–4 questions from this chapter every year. Based on data from 2013–2024, the average is 2.6 questions per exam. Given that each question carries 4 marks, this chapter alone can influence your score by up to 16 marks in a good year.

ADH (vasopressin), TSH, oxytocin, insulin, glucagon, adrenaline, and calcitonin appear most frequently. Questions on these hormones account for over 60% of all PYQs in this chapter. Focus on their source gland, target organ, and the disorder caused by their deficiency or excess.

The chapter is moderately difficult. The content is factual and NCERT-based, which makes it very scorable if studied systematically. The main challenge is the large number of hormones to remember. Using tables and diagrams significantly reduces this difficulty.

Nervous coordination uses electrical impulses through neurons — it is fast, short-lived, and localised. Chemical coordination uses hormones transported through blood — it is slower, longer-lasting, and can act on distant organs. NEET sometimes frames comparison questions between these two systems directly.

Skipping this chapter is not advisable. With 2–4 questions appearing consistently every year and the content being largely factual (direct NCERT), this is one of the highest return-on-effort chapters in NEET Biology. Most toppers treat it as a scoring chapter, not a difficult one.