Sourav Bio 
What is Evolution? Advertisements 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 … Read more
What is Fossils? Definition of Fossils Advertisements 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 … Read more
What is Evolution? Advertisements 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: … Read more
What is Neo-Darwinism Theory? Advertisements Neo-Darwinism is an integration of Charles Darwin’s theory of evolution by natural selection with Gregor Mendel’s theory of genetics. It arose from the recognition that Darwin had not adequately explained the existence of variations within species. In 1901, the Dutch botanist Hugo de Vries proposed the mutation theory of evolution, … Read more
What is Darwinism Theory? The Theory of Evolution – Darwinism Theory Advertisements The Theory of Evolution, formulated by Charles Darwin in the mid-19th century, is a scientific explanation for the diversity of life on Earth. It is considered one of the most important and well-supported scientific theories in the field of biology. At its core, … Read more
What is Lamarck’s Theory? Postulates of Lamarckism’s Theory Advertisements Lamarckism, formulated by Jean-Baptiste de Monet Lamarck, is based on four fundamental postulates that form the core of his evolutionary theory: Lamarck’s theory can be summarized by four main propositions: While Lamarckism has been largely superseded by modern evolutionary theory, it played a significant role in … Read more
What is Biogeny (Formation of Primitive Life)? 1. Formation of nucleic acids and nucleoproteins 2. Formation of Coacervates 3. Formation of Primary organism
What is Chemogeny? 1. Origin of Earth’s Primitive Atmosphere 2. Formation of Simple Inorganic Molecules (Water, Ammonia and Methane) Advertisements The formation of simple inorganic molecules, such as water, ammonia, and methane, played a significant role in the chemical evolution of the primitive Earth. During the early stages, when the surface temperature of the Earth was … Read more
Historical Overview Advertisements Throughout human history, the origin of life has captivated our curiosity and inspired various creation myths involving supernatural forces. However, ancient Greek thinkers were the first to approach the topic from a scientific standpoint, proposing the concept of spontaneous generation as a mechanism for complex organic forms to arise from simpler inorganic … Read more
What is Stem cell? Classification of Stem Cells Advertisements Stem cells can be classified into different categories based on their origin, potency, and differentiation potential. Here are the main classifications of stem cells: It’s important to note that the classification of stem cells is not always rigid, as there can be overlap and ongoing research … Read more
What is In Vitro Fertilization (IVF)? Why IVF is done? Advertisements IVF is performed for various reasons related to infertility and certain health conditions. Here are some common reasons why IVF may be done: Additionally, for individuals who do not have a functional uterus or face significant health risks during pregnancy, IVF with a gestational … Read more
What is Amniocentesis? (Amniotic Fluid Test) Sample for Amniotic fluid Examination (Amniocentesis) The purpose of the test Advertisements Amniocentesis, the examination of amniotic fluid, serves various purposes in prenatal diagnosis and assessment. The test provides valuable information about the fetus, allowing healthcare providers to make informed decisions regarding the health and well-being of both the … Read more
What is Teratogenesis? Teratogenic Agents 1. Infectious agents 2. Physical agents 3. Chemical agents Advertisements Chemical agents, including certain medications and substances, can have teratogenic effects on the developing fetus. These agents can disrupt normal development and contribute to the occurrence of birth defects. Here are some key points about different chemical agents and their … Read more
What is Ageing? Different Types of Aging Advertisements Aging is a complex process that can be categorized into different types based on various perspectives. Understanding these different types of aging can provide a comprehensive view of the aging process. Here are five common classifications: Overall, aging is a multifaceted process that encompasses various dimensions. By … Read more
What is Regeneration? Definition of Regeneration Advertisements Regeneration is the natural process by which organisms restore, repair, or replace lost or damaged body parts through the growth and differentiation of specialized cells, often known as stem cells. Types of Regeneration Regeneration, a pivotal biological process, can be classified into distinct types based on the underlying … Read more
What is Metamorphosis? Advertisements Metamorphosis is a biological process characterized by a profound transformation in the form, structure, or physiology of an organism as it progresses through distinct stages of its life cycle. It involves significant changes that are often irreversible and result in the emergence of a new developmental stage or life form. Stages … Read more
What is Placenta? Definition of Placenta Advertisements The placenta is a temporary organ that develops during pregnancy and connects the developing baby to the mother’s uterus. It provides oxygen, nutrients, and eliminates waste products from the baby’s blood. Types of Placenta There are several types of placenta, characterized by different factors and arrangements. Here are … Read more
What is Implantation? Time of Implantation Site of Implantation Implantation stages Advertisements Implantation is a complex process that involves a series of stages in the embryonic development of mammals. These stages are crucial for the successful attachment and invasion of the blastocyst into the uterine wall. The five recognized stages of implantation are migration and … Read more
What is Extra-embryonic Membranes? Types of Extra-Embryonic Membranes Advertisements During chick development, four types of extra-embryonic membranes are formed: Each of these extra-embryonic membranes is composed of two germ layers. The amnion and chorion consist of the extra-embryonic ectoderm and the somatic layer of mesoderm, collectively known as the somatopleure. On the other hand, the … Read more
What is Germ layer? Fate of The germ layers 1. Ectoderm 2. Mesoderm 3. Endoderm 4. Neural crest Formation of Three Germ Layers (i) Formation of Endoderm (ii) Formation of Mesoderm (iii) Formation of Ectoderm FAQ
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