Biology-II

This is a complete, free study companion for Biology-II — built around what the exam actually asks. The topics examiners repeat most are Double fertilisation and triple fusion in angiosperms, Restriction enzymes, palindromic sites and sticky ends, and Mendelian inheritance and test cross. The syllabus runs to 5 chapters. Below you'll find the full topic-frequency ranking, the exam paper pattern, every chapter, a step-by-step study plan, and the official downloads — everything in one place.

Everything here is free. We're an independent student resource, not the official NEET body, so always confirm the current syllabus and exam dates on the official NEET website before you rely on them.

Key information

Level: UG
Programme: Undergraduate
Stream: PCB
Exam: National Eligibility cum Entrance Test (Undergraduate)
Conducted by: National Testing Agency (NTA)

Most important topics (by past-paper frequency)

#	Topic	Times asked	Likelihood
1	Double fertilisation and triple fusion in angiosperms	8	80%
2	Restriction enzymes, palindromic sites and sticky ends	7	70%
3	Mendelian inheritance and test cross	7	70%
4	Hardy-Weinberg equilibrium and factors causing evolution	7	70%
5	Population growth models and carrying capacity	7	70%
6	DNA replication, Meselson-Stahl experiment and enzymes	7	70%
7	Genetic code and translation	6	60%
8	Bt cotton, cry genes and insect resistance	6	60%
9	Energy flow, trophic levels and 10 percent law	6	60%
10	Contraception and reproductive health methods	6	60%
11	Chromosomal disorders: Down, Turner and Klinefelter syndromes	6	60%
12	Biodiversity patterns, species-area relationship and hotspots	6	60%

Based on how often each topic appeared in official previous-year question papers.

What you will study (chapters)

Chapter 1: Reproduction
Chapter 2: Genetics and Evolution
Chapter 3: Biology and Human Welfare
Chapter 4: Bi Biotechnology and Its Applications
Chapter 5: Ecology and Environment

How to study Biology-II and score well

Start with the highest-frequency topics — In Biology-II, Double fertilisation and triple fusion in angiosperms, Restriction enzymes, palindromic sites and sticky ends, Mendelian inheritance and test cross, and Hardy-Weinberg equilibrium and factors causing evolution appear again and again in past papers. Master these first — they return the most marks for the time you put in.
Practise with previous-year papers — Solve the last 5–10 years of NEET Biology-II papers under timed, exam-like conditions. Past papers show exactly which topics repeat and how questions are worded.
Revise actively, not passively — Write a one-page summary for each of the 5 chapters — key definitions, formulas and the points examiners reward — then re-test yourself instead of re-reading.
Mark your answers with the official scheme — After each practice paper, score yourself against the official marking scheme. It shows how marks are awarded step-by-step, so you learn to present answers the way examiners expect.

Exam tips: how to score higher in Biology-II

Where students lose marks: rushing the high-weightage questions, skipping the steps the marking scheme rewards, and saving easy sections for last. Read the whole paper first, attempt your strongest section early to bank marks, and always show your working.

Manage your time: split your time in proportion to the marks each section carries, keep a few minutes at the end to check, and never leave a question blank — a partial, structured answer still earns partial marks.

Frequently asked questions

What are the most important topics in Biology-II?

Based on past papers, the most frequently asked topics include Double fertilisation and triple fusion in angiosperms, Restriction enzymes, palindromic sites and sticky ends, Mendelian inheritance and test cross. The full ranked list with how often each appears is in the "Most important topics" section above.

Where can I download Biology-II previous-year question papers?

Official NEET previous-year question papers are available on the official NEET website. Open the Question Papers section for the direct link, plus the exam pattern and the topics that repeat most.

How can I prepare for Biology-II faster?

Start with the highest-frequency topics, learn the exam pattern so you know how each section is marked, and practise with past papers. A subject-aware study tutor can quiz you on exactly these topics.

A Gyani AI tutor trained on the Biology-II syllabus and past papers can quiz you on the most-asked topics and show you exactly what to revise.