Formation and Fate of Germ Layers
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
Zoology Notes
Extra-embryonic Membranes in Chick – Definition, Types, Development, Functions
What is Extra-embryonic Membranes? Types of Extra-Embryonic Membranes 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 yolk
Implantation of embryo in Humans – Definition, Process
What is Implantation? Time of Implantation Site of Implantation Implantation stages 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 hatching,
Placenta – Definition, Structure, Types, Functions
What is Placenta? Definition of Placenta 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 the
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
Mechanisms of Animal 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
Orientation Patterns of Behaviour – Types, Importance, Examples
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
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
Honey bee – Definition, Types, Behaviour
What is Honey bee? Types of Honey bee There are several different types or species of honey bees. The most well-known and widely recognized species is the Western honey bee (Apis mellifera), which is native to Europe, Africa, and the Middle East. However, there are other species of honey bees as well. Here are a
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