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.
What are Sense Organs? Types of Sensory Receptors Sensory receptors in vertebrates are specialized structures that detect various types of stimuli from both the external and internal environments. These receptors convert sensory input into electrical signals, which are then transmitted to the brain for processing. Sensory receptors are classified based on their distribution, location, and … Read more
What is Urogenital System? Male and Female Excretory System The male and female excretory systems share significant similarities in structure, particularly concerning the kidneys, ureters, bladder, and urethra. Despite these commonalities, there are notable differences, particularly in the anatomy and function of the urethra. Development of Urogenital System The development of the urogenital system is … Read more
The digestive tract of vertebrates The digestive tract of vertebrates consists of several distinct parts, each playing a crucial role in the overall process of digestion. From the mouth to the glands associated with digestion, this system is designed to break down food, absorb nutrients, and expel waste. Below is a detailed breakdown of the … Read more
Cartilage and Bone: Key Components of the Vertebrate Skeletal System The vertebrate skeletal system is primarily composed of two types of connective tissue: cartilage and bone. Both play crucial roles in providing structural support, protection, and aiding in locomotion. Although both tissues are essential for the overall functioning of the skeleton, they differ significantly in … Read more
Parental Care in Amphibia 1. Protection by Nests, Nurseries, or Shelters in Amphibians Amphibians have evolved a variety of innovative strategies to protect their vulnerable eggs and larvae from predation. These methods often involve creating safe microhabitats that shield offspring until they are capable of defending themselves. The protection by nests, nurseries, or shelters can … Read more
Tetrapoda: Evolution from Fish to Land-Dwelling Vertebrates Tetrapods are a group of vertebrates that includes amphibians, reptiles, birds, and mammals. The first tetrapods evolved during the Devonian period from crossopterygian fishes, which were adapted to shallow, marshy environments. These fishes already possessed some features that made their transition to land possible. The transition from aquatic … Read more
What is Amphibian? Scientific Classification of Amphibian Category Classification Kingdom Animalia Phylum Chordata Clade Batrachomorpha Class Amphibia Order Anura, Caudata, Gymnophiona Amphibians are believed to have evolved from a population of osteolepid fishes during the later part of the Devonian period. These fishes began spending more time on land, moving from one pool to another. … Read more
What is Protochordata? Characteristics of Protochordata Protochordata, often referred to as primitive chordates, exhibit several defining features that differentiate them from more advanced vertebrates. These organisms are primarily marine and show a blend of both invertebrate and vertebrate characteristics. Below is a detailed overview of the key characteristics of protochordates: Classification of Protochordata Protochordate is … Read more
Number of tests Once in a year Participating Universities More than 140 Central and Participating universities 142 Subject/Programme Life Sciences, Microbiology, Biochemistry, Biotechnology,Bioinformatics, Zoology, Botany, Human Genetics,Molecular Medicine, Genomic Science and Nutrition Biology Organized by NTA Medium of examination Hindi and English Mode of examination Computer based test (CBT) Time duration 2 Hours (120 minutes) … Read more
Number of tests Once in a year Exam conducted by NTA Fellowship/ Assistantship M.Sc. Biotechnology & Allied Areas Rs.5000/- per monthM.Sc. Agricultural Biotechnology Rs.7500/- per monthM.Tech/M.V.Sc programmes Rs.12000/- per month Administering institutes DBT supported Post-Graduate (DBT-PG) programmes Medium of examination English only Mode of examination Computer based test (CBT) Exam pattern Number of tests (per … Read more
