1. The process of natural succession leading to formation of forests has been brought largely to a halt in developed countries as a result of the ever-increasing demand for agricultural land to feed the human population. 2. Extensive deforestation is carried out in developing countries to provide land for crop-growing and timber for fuel. 3.
The increased level of food production achieved in recent years has been due to the use of fertilisers, herbicides and pesticides although their use also carries disadvantages. 4. A significant increase in food production has been achieved by using rapid-response varieties of plants developed by selective breeding, although these plants need high concentrations of fertiliser. 5. Future genetic manipulation of plants by recombinant DNA technology is expected to produce high-yield crops requiring little or no fertiliser or pesticide. 6.
Under nutrition is the condition suffered by a person who fails to receive an adequate quantity of food. Malnutrition is the condition suffered by a person who fails to receive a balanced diet. Lack of an essential foodstuff in the diet leads to a deficiency disease. 7.
Water in renewable in that it is constantly recycled. However fresh water is a finite resource which could act as a limiting factor on the increase of the human population. 8. The demand for water is always increasing and it is therefore important to find ways of making more efficient use and reuse of it, such as constructing dams and micro-irrigation schemes. 9. Supplies of water in some parts of the world are unpredictable due to climatic changes.
The Essay on Title: The Effects of Microwaved Water on Plant Growth
Chemistry Investigatory Projects Title: The Effects of Microwaved Water on Plant Growth Problems: 1. What are the factors that make the microwave harmful? 2. What happens to the water (when microwaved) that causes it to affect plant growth? 3. What are the effects of microwaved water on the growth of plants? Hypotheses: 1. The micro wavelength radiation the microwave contains makes it harmful. 2. ...
10. Deforestation, erosion and desertification all lead to environmental degradation and disturb or eliminate the effects of the water supply cycle. 11. A disease can have a regulatory effect on a population and keep it in check. This natural check is removed when a cure is found for the disease. 12.
Vaccines and antibiotics have been used successfully against many diseases and have contributed to the increase in human population. 13. Malaria and childhood diseases still account for millions of deaths amongst children in developing countries every year. 14. Improved hygiene, mains sanitation and quality of living conditions promote development of good health and natural resistance to disease and contribute to population increase..
