Maharashtra Board Class 12 Biology Important Topics 2027
Every topic ranked by how often and how recently it was asked in 6 past board papers (2023–2026).
Top 10 most important topics
| # | Topic | Chapter | Asked in | Importance |
|---|---|---|---|---|
| 1 | Applications in agriculture and medicine | Biotechnology | Board 2023Board 2024Board 2025Board 2026 | ★★★★★ |
| 2 | Human circulatory system and cardiac cycle | Respiration and Circulation | Board 2023Board 2024Board 2025Board 2026 | ★★★★★ |
| 3 | Nutrient cycling and ecological succession | Ecosystems and Energy Flow | Board 2024Board 2025Board 2026 | ★★★★★ |
| 4 | Endocrine glands and hormones | Control and Coordination | Board 2023Board 2024Board 2025Board 2026 | ★★★★★ |
| 5 | Gametogenesis and menstrual cycle | Reproduction in Lower and Higher Animals | Board 2023Board 2024Board 2025Board 2026 | ★★★★☆ |
| 6 | Absorption of water and imbibition | Plant Water Relation | Board 2023Board 2024Board 2025Board 2026 | ★★★★☆ |
| 7 | Aerobic respiration (glycolysis, Krebs cycle, ETS) | Respiration and Circulation | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| 8 | Human brain and reflex action | Control and Coordination | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| 9 | Tissue culture and biofortification | Enhancement in Food Production | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| 10 | Nervous system and nerve impulse | Control and Coordination | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
Chapter-wise important topics
Reproduction in Lower and Higher Plants · Reproduction
| Structure of flower and gametogenesis asked 8× | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Seed and fruit development, apomixis and polyembryony asked 6× | Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Pollination and fertilisation (double fertilisation) asked 4× | Board 2023Board 2024 | ★☆☆☆☆ |
| Asexual reproduction in plants asked 2× | Board 2024Board 2026 | ★☆☆☆☆ |
Reproduction in Lower and Higher Animals · Reproduction
| Gametogenesis and menstrual cycle asked 11× | Board 2023Board 2024Board 2025Board 2026 | ★★★★☆ |
| Fertilisation, pregnancy and reproductive health asked 8× | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Human male and female reproductive systems asked 3× | Board 2024Board 2026 | ★☆☆☆☆ |
Inheritance and Variation · Genetics & Evolution
| Linkage, crossing over and sex determination asked 8× | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Genetic disorders and pedigree analysis asked 5× | Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Deviations (incomplete dominance, codominance) asked 3× | Board 2023Board 2024Board 2025 | ★☆☆☆☆ |
| Mendel's laws of inheritance asked 2× | Board 2024 | ★☆☆☆☆ |
Molecular Basis of Inheritance · Genetics & Evolution
| DNA as genetic material and its structure asked 6× | Board 2023Board 2025Board 2026 | ★★★☆☆ |
| Transcription and genetic code asked 4× | Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| DNA replication asked 2× | Board 2023Board 2024 | ★☆☆☆☆ |
| Translation and gene regulation (lac operon) asked 1× | Board 2024 | ★☆☆☆☆ |
Origin and Evolution of Life · Genetics & Evolution
| Theories of evolution (Darwin, Lamarck) asked 6× | Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Evidences of evolution asked 6× | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Hardy-Weinberg principle and speciation asked 4× | Board 2023Board 2024Board 2025 | ★☆☆☆☆ |
| Origin of life (chemical evolution) asked 2× | Board 2024Board 2026 | ★☆☆☆☆ |
Plant Water Relation · Plant Physiology
| Absorption of water and imbibition asked 10× | Board 2023Board 2024Board 2025Board 2026 | ★★★★☆ |
| Ascent of sap and transpiration asked 5× | Board 2024Board 2026 | ★★☆☆☆ |
| Guttation and mechanism of stomatal movement asked 4× | Board 2023Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Osmosis, water potential and plasmolysis asked 2× | Board 2023Board 2026 | ★☆☆☆☆ |
Plant Growth and Mineral Nutrition · Plant Physiology
| Plant growth regulators (auxins, gibberellins etc.) asked 8× | Board 2023Board 2024Board 2026 | ★★★☆☆ |
| Phases of plant growth asked 4× | Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Mineral nutrition and deficiency symptoms asked 4× | Board 2023Board 2025Board 2026 | ★★☆☆☆ |
| Photoperiodism and vernalisation asked 2× | Board 2026 | ★☆☆☆☆ |
Respiration and Circulation · Human Physiology & Health
| Human circulatory system and cardiac cycle asked 12× | Board 2023Board 2024Board 2025Board 2026 | ★★★★★ |
| Aerobic respiration (glycolysis, Krebs cycle, ETS) asked 8× | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Blood, blood groups and disorders asked 5× | Board 2023Board 2024Board 2025Board 2026 | ★★☆☆☆ |
Control and Coordination · Human Physiology & Health
| Endocrine glands and hormones asked 12× | Board 2023Board 2024Board 2025Board 2026 | ★★★★★ |
| Human brain and reflex action asked 8× | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Nervous system and nerve impulse asked 8× | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Sense organs (eye, ear) asked 1× | Board 2024 | ★☆☆☆☆ |
Human Health and Diseases · Human Physiology & Health
| Immunity and its types asked 6× | Board 2023Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Pathogens and infectious diseases asked 3× | Board 2023Board 2024Board 2026 | ★☆☆☆☆ |
| Drugs, alcohol and addiction asked 2× | Board 2026 | ★☆☆☆☆ |
| Cancer and AIDS asked 1× | Board 2024 | ★☆☆☆☆ |
Enhancement in Food Production · Biology in Human Welfare & Ecology
| Tissue culture and biofortification asked 8× | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Animal husbandry and dairy asked 4× | Board 2023Board 2026 | ★★☆☆☆ |
| Plant breeding and improvement asked 3× | Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
| Apiculture and fisheries asked 1× | Board 2024 | ★☆☆☆☆ |
Biotechnology · Biology in Human Welfare & Ecology
| Applications in agriculture and medicine asked 12× | Board 2023Board 2024Board 2025Board 2026 | ★★★★★ |
| Recombinant DNA technology asked 7× | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Principles and tools of biotechnology asked 3× | Board 2024Board 2026 | ★☆☆☆☆ |
| Genetically modified organisms and bioethics asked 2× | Board 2023Board 2026 | ★☆☆☆☆ |
Organisms and Populations · Biology in Human Welfare & Ecology
| Population interactions asked 7× | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Population attributes and growth asked 6× | Board 2023Board 2024Board 2026 | ★★☆☆☆ |
| Organism and its environment (adaptations) asked 2× | Board 2024Board 2026 | ★☆☆☆☆ |
Ecosystems and Energy Flow · Biology in Human Welfare & Ecology
| Nutrient cycling and ecological succession asked 11× | Board 2024Board 2025Board 2026 | ★★★★★ |
| Energy flow and ecological pyramids asked 3× | Board 2023Board 2024Board 2026 | ★☆☆☆☆ |
| Food chains, food webs and trophic levels asked 2× | Board 2023Board 2026 | ★☆☆☆☆ |
Biodiversity, Conservation and Environmental Issues · Biology in Human Welfare & Ecology
| Threats to biodiversity and conservation asked 6× | Board 2023Board 2024Board 2026 | ★★★☆☆ |
| Environmental pollution asked 4× | Board 2023Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Biodiversity and its patterns asked 4× | Board 2023Board 2024Board 2025 | ★☆☆☆☆ |
| Global environmental issues asked 1× | Board 2024 | ★☆☆☆☆ |
Importance = how often a topic was asked × how recent, with extra weight for the latest official sample paper.