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Introduction In a human, the normal chromosomes complement is 46, 44 of which are autosomes while 2 distinct chromosomes are deemed sex chromosomes, which determine the sex of an organism and various sex linked characteristics. In most animals, those who possess XX chromosomes are female while male animals possess an X and a Y chromosome. […]
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The Northern People’s Congress (NPC)-Organizational Structure In December , 1949, a cultural organisation known as Jamiyar Mutanen Arewa was founded in the North. This cultural organization was in 1951 transformed into a political party known as Northern People’s Congress (NPC). The leadership of the of the NPC was placed on Alhaji Ahmadu Bello and he
Alkalinity and Acidity Alkalinity and Acidity are measured using a scale of numbers from 0 to 10 called the pH scale. A solution with pH value of 7 is neutral. A solution with a pH value less than 7 is acidic while a solution with pH value greater than 7 is alkaline. Acidity increases with decreasing
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Introduction A salt is an ionic compound formed when the hydrogen of an acid is partly or completely replaced by a metal ion or ammonium ion. All salts are chemically and electrically neutral. Example: Diagram above shows that when the hydrogen ion in nitric acid is replaced by Na+, Ca2+, NH4+ or Al3+ ions, salts
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Rational Numbers We can write numbers such as 8, 4½, 1/5, 0.211, √49/16, 0.3 as exact fractions or ratios: 8/1, 9/2, 1/5, 211/1 000, 7/4, 1/3. Such numbers are called rational numbers. Numbers which cannot be written as exact fractions are called non-fractional numbers, or irrational numbers. √7 is an example of a non-rational number.
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Introduction A measure of central tendency is a single value that attempts to describe a set of data by identifying the central position within that set of data. As such, measures of central tendency are sometimes called measures of central location. They are also classed as summary statistics. The mean (often called the average) is
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Introduction The tangent is one of the three basic trigonometric functions, the other two being sine and cosine. These functions are essential to the study of triangles and relate the angles of the triangle to its sides. The simplest definition of the tangent uses the ratios of the sides of a right triangle, and modern
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Geometrical Construction Using ruler and compasses Remember the following when making geometrical constructions. 1. Use a hard pencil with a sharp point. This gives thin lines which are more accurate. 2. Check that your ruler has good straight edge. A damaged ruler is useless for construction work. 3. Check that your compasses are not too
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Introduction Good presentation can make statistical data easy to read, understand and interpret. Therefore it is important to present data clearly. i. There are two main ways of presenting data: presentation of numbers or values in lists and tables; ii. Presentation using graphs, i.e. picture. We use the following examples to show the various kinds
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ECONOMIC COMMUNITY OF WEST AFRICAN STATES (ECOWAS) Ecowas is a sub-region organization formed by fifteen West African countries in 1975. Lagos was originally its headquarters before it was moved to Abuja. It now has sixteen members states as a result of the inclusion of Cape-Verde. Ecowas’ main aim is to promote economic co-operation among members
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