Month: January 2023

Movement is a characteristic of all living organisms. Most animals move from place to place but some are sessile (i.e. fixed to the substratum). However, though not easily observed all living protoplasm shows movement of one type or another. Necessity… Read More

Introduction The structures involved in detecting the changes may be located far away from the ones that respond. There is need for a communication system within the body. The nervous system and the endocrine system perform this function, i.e. linking… Read More

Meaning of Evolution and Current Concepts Evolution is the development of organisms from pre-existing simple organisms over a long period of time. It is based on the similarities in structure and function that is observed in all organisms. All are… Read More

Introduction Genetics is the study of inheritance. The fact that the offspring of any species resemble the parents indicates that the characters in the parents are passed on to the offspring. Factors that determine characters (genes) are passed on from… Read More

TOPIC 1: GENETICS – Click to view TOPIC 2: EVOLUTION – Click to view TOPIC 3: RECEPTION, RESPONSE AND CO-ORDINATION IN PLANTS AND ANIMALS – Click to view TOPIC 4: SUPPORT AND MOVEMENT IN PLANTS AND ANIMALS – Click to… Read More

Concept of Growth and Development Growth is a characteristic feature of all living organisms. Most multicellular organisms start life as a single cell and gradually grow into complex organisms with many cells.  This involves multiplication of cells through the process… Read More

Introduction The process by which mature individuals produce offspring is called reproduction. Reproduction is a characteristic of all living organisms and prevents extinction of a species. There are two types of reproduction: sexual and asexual reproduction. Sexual reproduction involves the… Read More

Introduction Ecology is the study of organisms and their environment. All organisms show interdependence on one another. Organisms are affected by their environment, and they in turn affect the environment. Green plants manufacture food by photosynthesis which other organisms obtain… Read More