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Field management for optimum plant population are;GappingThinning
Problems created by decline of population in developed countries are;Underutilization of public utilities such as schools/health facilities.It leads to slow development of a country's economy.Inadequate manpower causing shortage of labour.High dependency ratio due to large number of elderly population.
Problems with an ageing population are;They provide a less mobile labour force- The older a person gets, the less willing they are to move from one place to another or even to change jobs.Low labour supply- Old people are less productive and thus cannot provide the much needed labour forceHigh dependency levels- the old will be less productive and therefore will be highly dependent on the few working groupwho will then be strained while providing for their needs.The country becomes less progressive because it lacks the input of more energetic youth.May lead to unemployment- this may be due to the fall in demand for goods and services required by the youth.
Economic importance of plant excretory products include;Tannis - Used in the treatment of leather; combines with animal protein to form a complex compound that is not easily broken down by animal proteases deposited on dead tissue of wood and barks of trees e.g Acacia, mangroove and wattle trees.Caffeine - Taken as a mild stimulant that increases mental activity and reduces fatigue found in coffee berries and tea leaves.Quinine - Used in the treatment of malaria. It is also found in the back of the cinchona tree and aloe vera leaves.Cocaine - Used as a local anaesthetic if taken in large quantities causes great physical and mental defect, addiction and heart disease. Found in leaves of cocoa plant.Cannabis - Extracted and used in the manufacture of drugs; stored in fruits, flowers and leaves of cannabis sativa.Nicotine - Used in the manufacture of insecticides and narcortic drugs; found in the leaves of tobacco plant.Rubber - Used in the shoe, tyre industry; obtained form latex of rubber plant.Gum Arabica - Used in food processing and printing industry; is an exudate from a variety of acacia trees.Colchicine - Used to induce polyploidism in plants and cancer therapy; it os an alkaloid derived from the plant used in genetics in plants and animal breeding researchPapain - Contains proteolytic substance used in the food industry as a meat tenderizer; It is an alkaloid obtained from raw pawpaw fruit skin.Khat - Is a mild stimulant used from medical purposes; obtained from catha edulis (miraa)Morphine - Used as a pain killer and anaesthesia to make patients sense dull and relax; obtained from poppy plant.Heroin - Induces drug dependence hence addictive; it is a drug obtained from morphine and uses as a narcotic.
Factors that favours the location of hydroelectric power plant include;Fast flowing water/waterfall to drive turbines/head of waterLarge volume of waterConstant flow of water/river without great fluctuationsAvailability of space for a reservoir/low populated areaHard basement rock for foundationNarrow gorge/valleyGovernment policy