Avatar for Sourav Pan

Sourav Pan

Founder of Biology Notes Online, Biology & Microbiology Educator, M.Sc. in Microbiology
Expertise
Microbiology, Immunology, Cell Biology, Molecular Biology, Genetics, Biotechnology, Biochemistry, Botany, Zoology
Education
University of Calcutta
Profile Last Updated: August 10, 2026

Sourav Pan is the founder and sole author of Biology Notes Online. He holds a Bachelor of Science (B.Sc.) degree and an M.Sc. in Microbiology from the University of Calcutta. He creates educational resources covering microbiology, immunology, biotechnology, genetics, cell biology, botany, zoology, and other life-science subjects.

His goal is to make complex biological concepts easier to understand through well-structured, student-friendly articles based on academic textbooks, peer-reviewed research, and authoritative scientific sources. In addition to writing new content, he regularly reviews and updates articles to improve their accuracy, clarity, and educational value.

Ethology (Animal Behaviour) Introduction, History

Ethology (Animal Behaviour) Introduction, History

What is Ethology? Definition of Ethology Ethology is the scientific study of animal behavior in natural conditions, focusing on understanding behavior as an evolutionary adaptation. History of Ethology The history of ethology is a fascinating journey that has shaped our understanding of animal behavior and its evolutionary roots. Charles Darwin, renowned for his groundbreaking work … Read more

Mechanisms of Animal Behaviour

Mechanisms of Behaviour

What is Animal Behaviour? Animal behaviour is the study of the activities and responses shown by animals in relation to their environment and other organisms. It includes all the actions that animals perform during their life such as searching for food, finding shelter, avoiding enemies, communication and reproduction. These activities help the animal to survive … Read more

Orientation Patterns of Behaviour – Types, Importance, Examples

Orientation Patterns of Behaviour

What is Orientation in Animal Behaviour? Orientation in animal behaviour is the process by which an animal finds and maintains a particular direction or position in its environment. This orientation response may be innate or learned. It helps the animal to move properly in relation to environmental stimuli such as light, gravity, chemicals, water current … Read more

Learning Behaviour – Definition, Types, Examples

Learning Behaviour - Definition, Types, Examples

What is Learning Behaviour? Learning by Animals Learning in animals is a fascinating subject that has captivated the attention of animal behaviorists. Understanding how animals learn and the mechanisms involved has been a topic of extensive research. Heyes (1994) has identified three commonly recognized types of experiences that can result in learning. The first type … Read more

Altruism among Animals – Definition and Evolution

Altruism among Animals - Definition and Evolution

What is Altruism? Evolution of Altruism The evolution of altruism has been a subject of fascination for socio-biologists, as seemingly selfless behavior can be observed in various animals, including humans. Over the past two decades, researchers have put forth three explanations to shed light on the evolution of altruistic behavior. The first explanation revolves around … Read more

Sexual Behaviour – Definition, Types, Factors

Sexual Behaviour - Definition, Types, Factors

What is Sexual Behaviour? Factors Affecting Sexual Behaviors Sexual behavior in organisms, including humans, is influenced by a variety of factors. These factors can be broadly categorized into biological, environmental, psychological, and social influences. Here are some key factors that can affect sexual behaviors: It is important to note that these factors interact and vary … Read more

Evidences of Evolution

Evidences of Evolution

What is Evolution? Evolution is a fundamental biological process that describes the changes in the inherited characteristics of populations of organisms over successive generations. It is the process by which species have emerged, diversified, and adapted to their environments over millions of years. At its core, evolution is driven by the following key concepts: Evolution … Read more

Fossils – Definition, Types, Formation, Dating, Examples

Fossils - Definition, Types, Formation, Dating, Examples

What is Fossils? Definition of Fossils Fossils are the preserved remains or traces of ancient organisms that provide evidence of past life on Earth. Types of Fossils Fossils come in various forms, providing valuable insights into the past life on Earth. Here are some of the different types of fossils: Furthermore, fossils can be classified … Read more

Processes of Evolutionary Change

Processes of Evolutionary Change

What is Evolution? Evolution refers to the process of change and development that occurs in living organisms over successive generations. It is the central concept in biology that explains the diversity of life on Earth and how species have come to exist in their present forms. Evolutionary theory explains how species evolve through the gradual … Read more