The stomach is a thick-walled large muscular sac which lies in the left portion of the abdominal...
Year: 2023
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...
Insolation The only source of energy for the earth’s atmosphere is the sun which has a surface...
This is a type of nutrition in which one organism obtains food from another organism and during...
Landforms of glaciated lowlands are mainly depositional in nature, brought about by both valley glacier and continental...
Glaciation generally gives rise to erosional features in the highlands and depositional features on the lowlands, though...
During the earth’s history, there have been many changes in the pattern of climatic regions. The most...
Mouth The mouth has a horny covered tongue to facilitate swallowing of food substances to the oesophagus....
Mating and laying of eggs The adult male and female mate. The female lays fertilized eggs on...
1) Temperatures: Coastlands with warm currents offshore tend to have mild climates for their latitudes. Coastlands with...
The Circulation of the Pacific Ocean The pattern of circulation in the Pacific is similar to that...
Let us now study more closely the circulation of ocean currents in the Atlantic Ocean. We shall...
Ocean currents are large masses of surface water that circulate in regular patterns around the oceans, as...
Like land masses, ocean water varies in temperature from place to place both at the surface and...
Within the nucleus of non-dividing cells are strands or string-like structures known as chromosomes. As the cell...
Almost every known chemical element can be found in varying proportions in the oceans whose most characteristic...
The ocean basins are in many ways similar to the land surface. There are submarine ridges, plateaux,...
The oceans occupy more than 70 per cent or 364 million sq km (140 million square miles)...
Aim: To demonstrate the effects of mineral deficiency on plants. Material required: Nine wide-mouthed glass jars,...
Movement is the ability of living organisms to move from one place to another. Reasons for movement...
Having examined the various factors which contribute to the location of industrial districts, we shall now look...
