The animal kingdom is divided into invertebrates (animals without backbones) and vertebrates (animals with backbones). Invertebrates...
The modern classification system based on physiology, biochemistry and embryology have revealed distinct similarities between living organisms...
Cockroach is an omnivorous animal eating anything ranging from starchy and sweet things to papers, clothes etc....
Movements in Hydra 1) Swaying Sometimes Hydra comes to rest on rock or other suitable hard surface...
Haemorrhage (bleeding) is the coming out of blood from the blood vessels which have been damaged. When...
Pollination is defined as the transfer of mature pollen grains from the anthers of one flower to...
Immediately after pollination, fertilization follows. Fertilization is the union of male and female gametes to form a...
This is the part of the plant which grows above the soil except the modified aerial roots....
The root system is the part of the plant growing in the soil. This excludes the underground...
The flowering plants form a group of plants known as Angiosperms. They are characterized by the possession...
Primates are the most highly developed of all mammals with large brain, forward-facing eyes with bilocular vision,...
The mammalian gametes are male gametes called sperm or spermatozoa (singular = spermato-zoon), while the female gametes...
Germination is a process by which the embryo of a seed grows out of its testa and...
The physical setting of Africa is defined by its relief, drainage, climate and vegetation, among others. These...
Parturition (labour) is the expulsion of the foetus, placenta and foetal membranes from the uterus. After about...
When the embryo has been implanted, it produces four extraembryonic membranes (membranes outside the body of the...
Industrial enterprise in Nigeria can be broadly classified into (i) local arts and craft, and (ii) modern...
It is possible to identify specific relief features on topographical maps by examining the way their contour...
The liver is the largest gland in the body. It is dark-red, spongy and lobed. The lobes...
The stomach is a thick-walled large muscular sac which lies in the left portion of the abdominal...
Experiment 1 Aim: To demostrate the action of ptyalin (saliva) on cooked starch. Method: Some saliva is...
Genetic traits are determined by genes located on the chromosomes. The sex of an organism is a...
Man cannot survive without water. The low population densities in the desert natural region is because of...
A fracture is any break in a bone. There are two kinds of fracture namely simple (closed)...
Neurones are specialized cells that transmit impulses (messages) around the body in form of electrical charges. The...
A bone is strong, hard and tough connective tissue mainly made of calcified material. Composition of...
Muscles can be referred to simply as the flesh mostly associated with bones to give shape to...
Transpiration is the loss of water vapour from different parts of the plant shoot. These parts include...
1) Capes and bays: On exposed coasts, the continual action of waves on rocks of varying resistance...
The most powerful agents of marine erosion are waves. Their origin is due to the sweeping of...
The action of the wind passing over a stretch of sea causes waves to develop and when...
Fish and tadpoles are aquatic vertebrates. They possess gills for gaseous exchange. Gills of fish Fish...
Planaria is a free-living, flat, slender and small worm. The digestive tract consists of a ventrally placed...
Trade is the selling and buying of goods and services between areas and peoples. Trade can be...
The seasonal variation in the volume of water in a river is known as the regime. A...
Since the earth is spherical in shape, the shortest distance between any two points on the globe...
This is the response of plant parts to the stimulus of gravity. Plant shoots grow away from...
The eyes are the organs of sight in the higher invertebrates and all vertebrates. They (eyes) are...
Regional Geography Regional geography is usually defined as the study of the ways in which the combinations...
Energy/ Power Sources Africa has various sources of energy or power distributed unevenly over Africa. The main...
Africa’s primary economic activities depend essentially on primary activities, which are associated with the natural resources that...
There are no special excretory organs or systems in plants. The plants as living things do carry...
The oxygen needed to oxidize lactic acid to pyruvic acid and from pyruvic acid to carbon oxide,...
Translocation is the transport of manufactured food substances from the leaves to all parts of the plant....
The occurrence of photosynthesis in plants can be shown by experiments. The easiest proof that photosynthesis has...
There are a number of international organizations in Africa formed with the aim of promoting peace, social...
Distribution Some parts of the world experience seasonal winds like land and sea breeze but on a...
Distribution The equatorial, hot, wet climate is found between 5° and 10° north and south of the...
Photosynthesisis the process by which carbohydrates or sugars are manufactured in the green parts of the plants...
Distribution The polar type of climate and vegetation is found mainly north of the Arctic Circle in...
