RESPIRATORY SYSTEM IN MAMMALS The respiratory system of mammals is the most complex of all respiratory systems. It comprises a pair of lungs enclosed in the thorax and connected to… Read More »RESPIRATORY SYSTEM OF MAMMALS & RESPIRATION IN PLANTS
DEFINITION/PHASES OF RESPIRATION The process of respiration involves the taking in of oxygen its transport within the body of the organism, its exchange in the cells and the eventual release… Read More »RESPIRATORY SYSTEM | DEFINITION, TYPES, FISH, TOAD, SKIN & LUNGS
In simple unicellular plant materials are exchanged by simple diffusion process between the plants and its aquatic environment. Hence there is no need for elaborate transport system. However, in higher… Read More »TRANSPORT SYSTEM IN HIGHER PLANTS
PROTECTIVE FUNCTION OF BLOOD The blood performs two basic functions in mammals and these are: (1) Transportation of various substances and (2) Protection of the body against diseases The blood… Read More »CIRCULATORY SYSTEM | CLOTTING, VESSELS, ARTERY, VEIN, HEART & ORGANS
INVERTEBRATES Feeding in Hydra Digestion in Planaria Digestion in Earthworms Digestion in insects (Grasshopper) VERTEBRATES Digestion in Birds Digestion in Rabbits FEEDING IN HYDRA Hydra feeds on small aquatic organisms… Read More »DIGESTIVE SYSTEM | HYDRA, EARTHWORM, INSECTS, BIRD, MAN
TYPES OF TEETH Human beings have two sets of teeth in their lifetime. The first set is called the milk teeth that grow when the child is few months old.… Read More »MAMMALIAN TEETH
To carry out life processes, all organisms (plants and animals) need tissues. Tissues are group of similar cells that carry out specific functions. Skeleton is the framework of the body… Read More »TISSUE AND SUPPORTING SYSTEM
LOCATION AND STRUCTURE OF CHROMOSOMES Chromatin granules (thread – like structures) found in the nucleus of eucaryotic cells are the precursors or raw materials of chromosomes. Chromosomes occur in… Read More »CHROMOSOME | THE BASIS OF HEREDITARY
Genetics is the scientific study of heredity and variation in all living things. The word genetics was coined by Dilliam Bateson (1906
ORGANIC EVOLUTION Organic evolution is the sum total of adaptive changes from pre–existing or old forms that has taken place over a long time resulting in diversity of forms, structures… Read More »THEORIES OF EVOLUTION
ADAPTIVE COLOURATION This is the possession by an organism of a colour which enables it to catch its prey, avoid its predators or enemies, secure mates and ensure their survival.… Read More »ADAPTIVE COLOURATION AND BEHAVIOURAL ADAPTATION
COMPETITION Competition is the process by which living organisms in the habitat struggle with one another for limited essential needs in the environment. Such scarce resources in plants include; light,… Read More »ADAPTATION FOR SURVIVAL
STRUCTURE OF A FRUIT A fruit is a matured fertilized ovary of a flower containing one or more seeds. Contrary to this, some plants do not undergo fertilization for the… Read More »FRUIT
Growth is defined as an irreversible increase in volume, size, and number of parts, length and weight of an organism It is an organic process which takes sometimes to accomplish.… Read More »GROWTH
Ecology This is the study of living organisms (plants and animals) in relation to their environment. Ecology is divided into two main branches. AUTECOLOGY– is the study of an individual… Read More »BASIC ECOLOGICAL CONCEPT
Autotrophic Nutrition This is the type of nutrition in which the organisms are able to manufacture their own food. Organisms which can manufacture or synthesize their own food are called… Read More »MODE OF NUTRITION
ANIMAL NUTRITION (FOOD SUBSTANCES) Food is a complex energy-rich organic matter which living organism feed on to obtain nutrients and substances necessary for life. Food substances are classified to six… Read More »ANIMAL NUTRITION
Nutrient cycle is defined as the circulation of certain nutrient such as carbon, sulphur and water in nature Carbon Cycle The carbon cycle is the way carbon (iv) oxide is… Read More »NUTRIENT CYCLING IN NATURE
Nutrition is defined as the process by which living organisms obtain and utilize food material from external environment for metabolic activities such as respiration, growth, excretion and reproduction. Photosynthetic or… Read More »PLANT NUTRITION
Organization of life is defined as the existence of life from a single called organisms to a multicellular organisms with complex form that perform different functions Levels of Organization 1 … Read More »Organization of Life