There are mainly three branches of Biology- botany, zoology and microbiology.
- A
Anatomy: Study of the structure of living things and their parts
Astrobiology: Study of the living universe - B
Biotechnology: Study of technology related to biology
Botany: Scientific study of plants
Biochemistry: Study of chemical processes within or related to living organisms
Biophysics: Study of physical processes and phenomena in living organisms
Bionics: Study of mechanical systems that work like living things or as part of a living organism
Bioinformatics: Study of interpreting biological information through computer science - C
Cell Biology: Study of cell structure and functions
Chemical Biology: Study of the use of chemistry to solve biological problems
Computational Biology: Study of using biological information to develop algorithms to comprehend biological systems
Conservation Biology: Study of environmental conservation and biodiversity on the earth
Chronobiology: Study of effects of time on biological events as well as internal biological rhythms and clocks - D
Developmental Biology: Study of the growth and development processes of plants and animals - E
Evolutionary Biology: Study of evolutionary processes and diversification and adaptation of life over time
Ecology: Study of how organisms and how they interact with the environment around them
Environmental Biology: Study of evolution, habitats and adaptations of living organisms - G
Genetics: Study of genes, genetic variation and heredity in living beings
Geobiology: Study of how physical, chemical and biological processes influence each other in natural habitats
Gerontology: Study of ageing, its physical, mental, social, psychological and cultural effects, etc. - H
Human Biology: Study of human species, their evolution, genetics, heredity, anatomy and other aspects
Human Genetics: Study of the human genome and transmission of genes from one generation to another - I
Immunology: Study of the immune system in all organisms - L
Lichenology: Study of Lichens - M
Marine Biology: Study of marine organisms and marine life
Mycology: Study of fungi
Microbiology: Study of microorganisms, i.e. minute life-forms
Molecular Biology: Study of chemical structures and biological processes of molecules - N
Neurobiology: Study of nervous systems and cell functions
Nutrition Science: Study of food, its nutrients and their effects on health and diseases - P
Pathology: Study of disease or injury
Physiology: Study of how the human body functions
Paleobiology: Study of applied life science biology on the earth science paleontology
Phycology: Study of algae
Parasitology: Study of parasites, their hosts and their relationships
Plant Physiology: Study of plant function and behaviour, in terms of their inner structures and functions
Photobiology: Study of beneficial or bad impact of light on living organisms - R
Radiobiology: Study of ionizing radiation and its interactions with human beings - S
Structural Biology: Study of structure of biological molecules
Soil Biology: Study of living organisms in the soil
Systems Biology: Study of biological systems - T
Taxonomy: Study of naming, classifying, arranging, describing living organisms - V
Virology: Study of viruses as well as virus diseases - Z
Zoology: Study of plant kingdom