DIGESTIVE ENZYMES
Enzymes are organic catalysts of protein origin produced by living cells which help to speed up or slow down the rate of chemical reactions but remain chemically unchanged at the end of the reaction. Classes of enzymes Enzymes are usually classified according to the type of food they act upon. Generally three classes are known. They are amylases, proteases and lipases. 1) Amylases Amylases act on carbohydrates (starches and complex sugars) changing them to glucose which the body can absorb. Some amylase enzymes are: Maltase, sucrase, lactase and ptyalin. Maltase changes maltose to glucose. Sucrase changes sucrose to glucose and fructose. Lactase changes lactose to galactose and glucose.…
FOOD TESTS
Food substances are chemical compounds and therefore can be tested chemically. Test for carbohydrates Test for glucose (a reducing sugar) To a little solution of glucose, add small quantities of Fehling’s solutions A and B (equal amount) and heat gently. A brick-red precipitate shows the presence of glucose. Benedict’s Test Equal quantities of glucose solution and Benedict’s solution in a test-tube are boiled and allowed to cool. Result: Red or orange precipitate is formed showing the presence of glucose. Test for starch Iodine test: To a starch solution, add few drops of iodine solution. Result: Blue black colour shows the presence of starch. OR To a surface…
PROBLEMS OF TOURISM IN NIGERIA
Some of the major problems facing tourism development in Nigeria include the following: Inadequate funding: In Nigeria, the tourism industry is poorly funded. Poor funding has led to the poor development of the sub-sector. lack of access roads: In Nigeria, there is basically lack of access roads to most resort centres. Many of the roads are in bad shape and this tends not to attract tourists to such centres. Poor publicity: Lack of effective publicity or communication system for publicizing the scenery, wildlife and cultural attractions to visitors is a big problem in the country. Inadequate personnel: One of the problems of developing tourism attractions in Nigeria is the inadequacy…
JUSTIFICATION FOR TOURISM
Tourism is an activity done by an individual or a group of individuals, which leads to the movement from one place to another or a country to another for performing a specific a specific task or a visit to a place or several places for the purpose of entertaining which lead to an awareness of other civilizations and culture, also increasing the knowledge of countries, culture and history. One of the most important subjects of tourism is attractions. Attractions are the most important components in the tourism system. Attractions are the main motivators for tourist’s trips and the core of the tourism product, without attractions, there would be no need…
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AGRICULTURAL POLLUTION
MEANING OF AGRICULTURAL POLLUTION Agricultural pollution is defined as the release of toxic or harmful substances into the environment by natural forces or man and other animals to an extent that causes biological damage to man and his resources. In other words, agricultural pollution is the release of harmful substances into the environment i.e, water, air and land in quantities or to the level that are harmful to man, animals and plants. The harmful substances that cause pollution in the environment are called pollutants. SOURCES OR CAUSES OF POLLUTION The main sources or causes of pollution of agricultural land or ponds can be classified as Air pollution. Noise pollution.…
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