Biology-I

This is a complete, free study companion for Biology-I — built around what the exam actually asks. The topics examiners repeat most are C3 and C4 photosynthesis: first stable product, RuBisCO, PEP carboxylase, Kranz anatomy, Plant hormones: auxin, gibberellin, cytokinin, ethylene, ABA functions, and Taxonomic hierarchy, binomial nomenclature, taxonomical aids. The syllabus runs to 11 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 frequently examined topics

#	Topic	Times asked
1	C3 and C4 photosynthesis: first stable product, RuBisCO, PEP carboxylase, Kranz anatomy	16
2	Plant hormones: auxin, gibberellin, cytokinin, ethylene, ABA functions	23
3	Taxonomic hierarchy, binomial nomenclature, taxonomical aids	17
4	Cell organelles: lysosomes, mitochondria, chloroplasts, ribosomes, cilia and flagella	20
5	Mineral nutrition: essential elements, deficiency symptoms, nitrogen fixation	21
6	Respiration: glycolysis, Krebs cycle, ETS, fermentation, RQ	19
7	Transport in plants: transpiration pull, pressure-flow hypothesis, water potential	18
8	Biomolecules and enzymes: peptide bond, enzyme classes, competitive inhibition	17
9	Plant morphology: floral families, aestivation, placentation, root and stem modifications	19
10	Cell division: meiosis, crossing over, mitosis, cell cycle phases	14
11	Five kingdom classification: Monera, Protista, Fungi, lichens, viruses	18
12	Photosynthetic light reaction: photosystems, photolysis, photophosphorylation	14

Counted across the official previous-year question papers we have analysed for this subject. It shows what has been asked before — it does not predict what will appear in your exam. Always confirm the current syllabus on the official portal.

What you will study (chapters)

Chapter 1: What is Living?
Chapter 2: Biodiversity, Classification and Taxonomy
Chapter 3: Morphology, Tissues and Plant Anatomy
Chapter 4: Animal Tissues and Organ Systems
Chapter 5: Cell Theory and Cellular Organization
Chapter 6: Biomolecules, Enzymes, and Cell Division
Chapter 7: Transport in Plants
Chapter 8: Mineral Nutrition in Plants
Chapter 9: Photosynthesis in Higher Plants
Chapter 10: Respiration in Plants
Chapter 11: Plant Growth and Development

How to study Biology-I and score well

Start with the highest-frequency topics — In Biology-I, C3 and C4 photosynthesis: first stable product, RuBisCO, PEP carboxylase, Kranz anatomy, Plant hormones: auxin, gibberellin, cytokinin, ethylene, ABA functions, Taxonomic hierarchy, binomial nomenclature, taxonomical aids, and Cell organelles: lysosomes, mitochondria, chloroplasts, ribosomes, cilia and flagella 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-I 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 11 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-I

Where students lose marks: attempting questions they have not truly eliminated options for, spending too long on one hard question, and rushing the sections they know best. Read the whole paper first, bank the marks you are sure of, and come back to the rest.

Manage your time and guess carefully: split your time in proportion to the marks each section carries and keep a few minutes at the end to check. This paper carries negative marking, so attempt a question only when you can rule out at least one or two options — a blind guess costs you marks. Confirm the exact marking scheme for your session on the official portal.

Frequently asked questions

What are the most important topics in Biology-I?

Based on past papers, the most frequently asked topics include C3 and C4 photosynthesis: first stable product, RuBisCO, PEP carboxylase, Kranz anatomy, Plant hormones: auxin, gibberellin, cytokinin, ethylene, ABA functions, Taxonomic hierarchy, binomial nomenclature, taxonomical aids. The full ranked list with how often each appears is in the "Most important topics" section above.

Where can I download Biology-I 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-I 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-I syllabus and past papers can quiz you on the most-asked topics and show you exactly what to revise.