powerpoint presentation on resources and development class 10 cbse
- 4. • A resource is a source or supply from which benefit is produced. Typically resources are materials, money, services, staff, or other assets that produce benefit.. Re
- 9. •Biotic – •Biotic -Biotic resources are obtained from the biosphere (living and organic material), such as forests and animals, and the materials that can be obtained from them. •Abiotic – Abiotic resources are those that come from non-living, non-organic material.
- 11. •Renewable resources are ones that can be replenished naturally. •Some of these resources, like sunlight, air, wind, etc., are continuously available and their quantity is not noticeably affected by human consumption.
- 12. •A natural resource such as coal, gas, or oil that, once consumed, cannot be replaced. •Most energy resources currently in use are non- renewable. •than nature can create them.
- 18. Potential Resources- These are known to exist and may be used in the future. For example, petroleum may exist in many parts of India and Kuwait that have sedimentary rocks, but until the time it is actually drilled out and put into use, it remains a potential resource. Developed Resources-Developed resources are those that have been surveyed, their quantity and quality determined and are being used in present times.
- 19. Stock Resources -– Stock resources are those that have been surveyed but cannot be used by organisms due to lack of technology. For example: water is a compound of 2 inflammable gases: hydrogen and oxygen, which can be used as a rich source of energy. Reserve Resources -– The part of an actual resource which can be developed profitably in the future is called a reserve resource. The water in dams, forests etc. is a reserve which can be used in future.
- 21. •With increasing population, the demand for resources is increasing. •There are marked differences in resource distribution and associated economic inequality between regions or countries, with developed countries using more natural resources than developing countries. •Typically resources cannot be consumed in their original form, but rather through resource development they must be processed into more usable commodities.
- 22. •SUSTAINABLE DEVELOPMENT is development that meets the needs of the present without compromising the ability of future generations to meet their own needs. •Sustainable development constantly seeks to achieve social and economic progress in ways that will not exhaust the earth’s finite natural resources.
- 23. a. Many resources got depleted. Ex: Forest b. Resources got accumulated in the hands of few people. The society is divided into rich and poor. c. Global warming, ozone layer depletion, environmental degradation are other problems.
- 25. The upper most layer of the earth’s crust which is loose , broken and useful for plants is called soil. Soil consists of mineral matter such as sand and clay and Organic matter such as humus, bacteria and earth worms. Soil is formed mainly due to the process of weathering. As a result of weathering a layer of loose rock materials is formed on the land surface. If this layer remains undisturbed for a long period of time, chemical, physical and organic changes take place in it. These changes lead to the formation of soil.
- 26. 1) Climate: Climate decides the rate of weathering and the type of vegetation. 2) Topography: Topography of the land decides the accumulation of soil. 3) Nature of parent rock: It decides compositions and texture of the soil. 4)Vegetation: Vegetation decides the amount of humus available in the soil.
- 27. i). Man depends on the soil directly or indirectly for his food. ii). Agriculture can be practiced only if soils are available. iii). Man gets the materials needed for shelter and clothing directly (or) indirectly from the soil. iv). Soils are essential for the growth of forests.
- 29. i). Alluvial soil is the most fertile and wide spread soil found in India. ii). It is formed due to the deposition of fine silt called alluvium by the rivers. iii). It is found in the northern plains, Gujarat plains and the coastal plains. iv). It consists of sand, silt and clay.
- 33. Red soils are formed due to the weathering of crystalline igneous rocks under low rainfall conditions. It is red in colour because of the presence of iron in it. It is found in Tamilnadu, Karnataka, Andhra Pradesh, Orissa, Chattisgarh and Jharkhand.
- 35. The word laterite originated from the Latin word later which means brick. Laterite soil is formed due to intense leaching caused by tropical rainfall. Humus content is less because the micro-organisms get destroyed due to high temperature.
- 37. Arid soils are red or brown in colour. They are sandy and saline. Humus and moisture contents are very less. They can be cultivated after irrigation. Kankar layer in the soil prevent the water from seeping under ground.
- 39. Forest soils are found in hilly and mountainous regions. They are loamy and silty in valleys and coarse in the upper slopes. In Himalayas they suffer denudation and are acidic with low humus content. The soils found in the lower slopes of the valley are fertile.
- 40. Removal of top soil from one place to another by natural agencies is called soil erosion. It is caused by running water and wind. Deforestation, over grazing and unscientific agricultural practices are responsible for large scale soil erosion.
- 41. The rain water when moves down on an uneven land scoops away the soil and form deep channels called gullies. This type of erosion is called gully erosion. A land which is broken into many small parts by the gullies is called bad land. A bad land is unfit for cultivation and for other economic activities.
- 43. Some times water flows as a sheet over large areas down a slope. The water takes away the top soil. This type of erosion is called sheet erosion.
- 44. i). Contour ploughing reduces the flow of water and prevent soil erosion. ii). In hilly areas terraced farming should be followed. iii). Strip farming helps to reduces the force of winds. iv). Shelter belts of plants around the fields reduce soil erosion. v). Afforestation should be practiced on a large scale and deforestation should be stopped. vi).Over grazing by animals should be avoided.