Post Views: 1 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. … 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
Post Views: 1 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… Read More »THEORIES OF EVOLUTION
Post Views: 1 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… Read More »ADAPTIVE COLOURATION AND BEHAVIOURAL ADAPTATION
Post Views: 8 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… Read More »ADAPTATION FOR SURVIVAL
Post Views: 0 VARIATION IN POPULATION Population is a group of organisms of the same specie living in a specified area within a given period of time. Variation refers to… Read More »VARIATION IN POPULATION
Post Views: 2 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… Read More »FRUIT
Post Views: 0 DEVELOPMENT OF ZYGOTE IN FLOWERING PLANTS, GERMINATION OF SEEDS, ADAPTIVE FEATURES IN A DEVELOPING ANIMAL DEVELOPMENT OF ZYGOTE IN PLANTS Pollination is followed by fertilization and the… Read More »DEVELOPMENT OF ZYGOTE IN FLOWERING PLANTS
Post Views: 1 COURTSHIP BEHAVIOURS IN ANIMALS Courtship is a reproductive communication between males and females of a species that ends in sexual union. Courtship behaviours in animals include PAIRING:… Read More »DEVELOPMENT OF NEW ORGANISMS
Post Views: 0 THE ORGAN OF HEARING Mammals have two ears on each side of the head. The greater part of it is enclosed in the skull for protection. The… Read More »ORGAN OF HEARING, SMELL AND TASTE
Post Views: 0 SENSORY RECEPTORS All living organisms respond to changes in their environment (stimuli). These changes can be mechanical, electromagnetic, chemical or thermal. Though most cells in the bodies… Read More »SENSE ORGANS
Post Views: 0 REFLEX AND VOLUNTARY ACTIONS Actions are responses to stimuli. These actions are grouped into two: involuntary (reflex) and voluntary actions. REFLEX ACTIONS Reflex actions are automatic… Read More »REFLEX, VOLUNTARY ACTIONS AND CONDITIONAL REFLEXES
Post Views: 1 THE PERIPHERAL NERVOUS SYSTEM These include the sensory system (receptor and nerves leading from all parts of the body to the CNS) and the motor system (nerves… Read More »THE PERIPHERAL NERVOUS SYSTEM
Post Views: 0 THE NERVOUS SYSTEM The nervous and hormonal systems co-ordinate various biological activities in the body of multicellular animals, the basic structural unit of nervous system is the… Read More »NERVOUS CO-ORDINATION
Post Views: 0 HORMONES AND ENDOCRINE GLANDS Hormones are chemical substances produced or secreted by endocrine glands (ductless glands) in response to various stimuli. Hormones are secreted into the bloodstream… Read More »HORMONAL CO-ORDINATION
Post Views: 1 STRUCTURE OF THE LIVER The liver is the largest organ in the body of a mammal with a weight of about 1.25kg. It is reddish brown, soft… Read More »LIVER AND SKIN: STRUCTURE, FUNCTIONS, DISEASES AND CARE
Post Views: 0 HOMEOSTASIS Homeostasis is the process by which a fairly constant internal environment is maintained in an organism. The internal environment of an organism is made up of… Read More »REGULATION OF INTERNAL ENVIRONMENT