List of Major Branches of Biology

List of Major Branches of Biology

S. No.	Branch of Biology	Main Area of Study	Category / Scope / Applications
1	Botany	Plants	Studies plant structure, growth, reproduction, classification, evolution and ecological relationships.
2	Zoology	Animals	Studies animal structure, behaviour, physiology, classification, evolution and distribution.
3	Microbiology	Microorganisms	Studies bacteria, archaea, microscopic fungi, protozoa and other microorganisms; applied in medicine, agriculture and biotechnology.
4	Cell Biology	Cells	Investigates cell structure, function, division, signalling and interactions between cellular components.
5	Molecular Biology	Biological molecules	Studies DNA, RNA, proteins and the molecular mechanisms that control cellular activities.
6	Genetics	Heredity and variation	Studies genes, inheritance, mutations and variation within populations and families.
7	Genomics	Entire genomes	Studies the structure, function, evolution and analysis of complete genomes.
8	Biochemistry	Chemistry of living organisms	Investigates enzymes, proteins, carbohydrates, lipids, metabolism and chemical reactions in living systems.
9	Anatomy	Body structure	Studies the internal and external structures of organisms, including organs, tissues and organ systems.
10	Physiology	Biological functions	Studies how cells, organs and organisms function, including respiration, circulation, digestion and regulation.
11	Histology	Biological tissues	Studies the microscopic structure of tissues and their organization in organs.
12	Embryology	Early development	Studies the formation and development of embryos from fertilization through early developmental stages.
13	Developmental Biology	Growth and development	Investigates how organisms develop, differentiate and change throughout their life cycles.
14	Evolutionary Biology	Evolution of life	Studies evolutionary processes, natural selection, adaptation, speciation and the common ancestry of organisms.
15	Ecology	Organisms and environments	Studies interactions among organisms and between organisms and their physical environments.
16	Taxonomy	Classification of organisms	Identifies, describes and classifies organisms using their characteristics and evolutionary relationships.
17	Systematics	Evolutionary relationships	Studies organism diversity and evolutionary relationships to develop classifications and phylogenetic trees.
18	Paleontology	Ancient life	Studies fossils and the history, evolution and extinction of organisms through geological time.
19	Marine Biology	Life in oceans	Studies marine organisms, ocean ecosystems, biodiversity and the effects of environmental change.
20	Freshwater Biology	Freshwater ecosystems	Investigates organisms and ecological processes in rivers, lakes, ponds and wetlands.
21	Mycology	Fungi	Studies fungi, including yeasts, molds and mushrooms, as well as their ecology, reproduction and uses.
22	Virology	Viruses	Studies viruses, their structure, replication, evolution and interactions with host organisms.
23	Parasitology	Parasites	Studies parasites, their life cycles, host relationships and the diseases they may cause.
24	Immunology	Immune systems	Investigates immune responses, antibodies, immune cells, vaccination, allergies and autoimmune conditions.
25	Neurobiology	Nervous systems	Studies neurons, brain function, neural circuits, sensory processing and nervous-system disorders.
26	Endocrinology	Hormones	Studies hormones, endocrine glands and the regulation of growth, metabolism, reproduction and other functions.
27	Reproductive Biology	Reproduction	Investigates reproductive systems, gametes, fertilization, reproductive cycles and fertility.
28	Ethology	Animal behaviour	Studies animal behaviour, communication, social interactions, instincts and behavioural evolution.
29	Ornithology	Birds	Studies bird diversity, anatomy, behaviour, migration, ecology and conservation.
30	Entomology	Insects	Investigates insect classification, physiology, behaviour, ecology and roles in agriculture and ecosystems.
31	Ichthyology	Fishes	Studies fish classification, anatomy, evolution, behaviour and aquatic ecology.
32	Herpetology	Reptiles and amphibians	Studies reptiles and amphibians, including their evolution, physiology, behaviour and conservation.
33	Mammalogy	Mammals	Studies mammalian diversity, anatomy, behaviour, evolution and ecological relationships.
34	Phycology	Algae	Studies algae, their diversity, photosynthesis, ecology and applications in food, industry and biotechnology.
35	Bacteriology	Bacteria	Studies bacterial structure, classification, physiology, genetics and interactions with hosts and environments.
36	Structural Biology	Biomolecular structures	Investigates the three-dimensional structures of proteins, nucleic acids and molecular complexes.
37	Bioinformatics	Biological data	Uses computing, statistics and algorithms to analyze DNA sequences, genomes, proteins and other biological datasets.
38	Biotechnology	Biological technologies	Uses cells, organisms and biological molecules to develop medicines, improved crops, industrial products and diagnostic tools.
39	Synthetic Biology	Engineering biological systems	Designs or modifies biological components and systems for research, medicine, manufacturing and environmental applications.
40	Systems Biology	Biological networks	Studies how genes, proteins, cells and organs interact as integrated systems, often using computational models.
41	Biophysics	Physical principles of life	Applies physics and quantitative methods to investigate biological structures, molecular processes and living systems.
42	Astrobiology	Life in the universe	Studies the origin, evolution and limits of life on Earth and the possibility of life beyond Earth.
43	Exobiology	Potential extraterrestrial life	Investigates the possibility of life beyond Earth, including possible biological processes and environments on other worlds.
44	Conservation Biology	Biodiversity protection	Studies methods to protect species, habitats, genetic diversity and ecosystems from extinction and environmental threats.
45	Environmental Biology	Biological responses to the environment	Investigates how organisms respond to pollution, climate change, habitat changes and other environmental factors.
46	Plant Physiology	Plant functions	Studies photosynthesis, respiration, water transport, plant hormones and plant responses to environmental conditions.
47	Plant Pathology	Plant diseases	Studies diseases caused by fungi, bacteria, viruses and other agents, including methods of diagnosis and control.
48	Wildlife Biology	Wild animals and habitats	Studies wild animal populations, habitats, behaviour, biodiversity and conservation management.
49	Human Biology	Human organisms	Studies human anatomy, physiology, genetics, development, variation and interactions with the environment.
50	Medical Biology	Biological basis of disease	Investigates biological mechanisms of disease, human health, disease-causing organisms and potential treatments.
51	Pathology	Diseases and tissue changes	Studies the causes and mechanisms of diseases and the structural and functional changes they produce.
52	Pharmacology	Drugs and biological systems	Studies how drugs interact with living organisms, including their effects, mechanisms and safety.
53	Toxicology	Effects of harmful substances	Studies the harmful effects of chemicals, toxins and other agents on organisms and ecosystems.
54	Agricultural Biology	Biology in agriculture	Applies biological knowledge to crop improvement, soil organisms, pest management, livestock and agricultural productivity.
55	Astrobotany	Plants beyond Earth	Explores plant growth and plant-related biological processes in space environments and potential extraterrestrial habitats.

Notes:

Biology is the scientific study of life, living organisms and their interactions with the environment.
Its major traditional branches include botany, zoology and microbiology.
Modern biology includes molecular biology, genetics, genomics, biotechnology, bioinformatics and systems biology.
Some entries are specialized subfields rather than independent major branches. For example, ornithology is a branch of zoology, while plant physiology is a subfield of botany.
Astrobiology and exobiology overlap considerably and investigate the possibility of life beyond Earth; neither has confirmed extraterrestrial life.
This is a broad educational list, not an exhaustive classification of every biological discipline.

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List of Major Branches of Biology

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