SL / HL
IB Biology
Notes and practice for the 2025 IB Biology syllabus.
- All 40 subtopics of the 2025 syllabus, A1.1–D4.3, in guide order
- Notes for SL and HL, with HL-only content marked
- IB-style practice question PDFs for members
✦ Award-Winning STEM Platform
Learn Biology.
Understand It.
Master Your Exam.
Simple explanations, organized topics, useful study resources and practice questions.
H₂O
CO₂
ATP
NaCl
Biology organized around your syllabus
Start with the examination you are preparing for.
NEET Biology
Chapter-focused Biology for the official NEET syllabus.
- NCERT Class XI and XII, chapter by chapter
- Matched to the official NMC NEET (UG) 2026 syllabus
- Chapter-wise MCQs with answer keys
- Full-length NEET sample test papers
Study by topic
Find the Biology concept you need without searching through a long list of unrelated articles.
Cell Biology
Cells, microscopy, membranes, cell cycle, stem cells and cellular chemistry.
ExplorePhotosynthesis & Cell Respiration
Cell respiration and photosynthesis.
ExploreMolecular Biology
DNA, RNA, replication, protein synthesis and gene expression.
Coming soonGenetics & Inheritance
Mendel, linkage, sex determination and genetic disorders.
ExploreEvolution
Origin of life, natural selection, Hardy–Weinberg and speciation.
Coming soonDiversity & Classification
Living world, kingdoms, viruses, plants, animals and cladistics.
ExploreHuman Physiology
Breathing, circulation, excretion, movement, homeostasis and digestion IB only.
ExploreNeural & Hormonal Coordination
Neurons, nervous system, endocrine glands and signalling.
Coming soonReproduction & Development
Plant and human reproduction and reproductive health.
ExploreHealth, Disease & Immunity
Pathogens, immunity, vaccines, cancer and drug abuse.
ExploreEcology & Environment
Populations, ecosystems, energy flow, climate change and conservation.
ExploreBiotechnology & Microbes
Microbes in human welfare, rDNA technology and its applications.
Explore
Free IB Biology Notes and NEET Biology MCQs
Why Competitors Point
Competitors Point gives you free IB Biology notes and exam-focused study material written by a biology teacher. Every chapter follows the syllabus, explains each idea in simple language, and uses clear labelled diagrams so you can understand a topic instead of just memorising it.
- Syllabus-aligned
- Simple language
- Labelled diagrams
Notes for IB SL and HL students
Our chapters follow the new 2025 IB syllabus themes, from cell biology, membranes and the cell cycle to genetics, gas exchange, digestion and human physiology. Each chapter ends with IB-style practice questions and a markscheme.
Chapter-wise practice for NEET
For NEET, every page is matched to the rationalised NCERT Class 11 and 12 syllabus, with chapter-wise MCQs, answer keys and full-length sample test papers.
Choose a topic below to start learning, or go straight to the IB hub.