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  • W.B.C.S. Main 2018 Question Answer – Geography – Concentration Of Population.
    Posted on November 27th, 2018 in Geography of India & WB
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    W.B.C.S. Main 2018 Question Answer – Geography – Concentration Of Population.

    1) Explain the factors which facilitate the concentration of population in any region. Mention the several measures of population growth. State the significance of age-sex structure of population.

    Factors that Affects Population Distribution

    It is, however, not to suggest that population distribution on the earth surface is determined by physical factors alone, for within the broad framework of physical attractions and constraints, cultural factors strongly influence the way mankind is distributed over the earth (Hornby and Jones, 1980:20). Thus, apart from physical factors, numerous social, demographic, economic, political and historical factors affect population distribution.Continue Reading W.B.C.S. Main 2018 Question Answer – Geography – Concentration Of Population.

    These factors operate not in isolation but in combination with each other. One cannot, therefore, isolate the influence of any one factor on population distribution. Further, the interplay between these determinants is generally very complex. The primary task of a population geographer, therefore, is to explain the irregularities in population distribution in terms of the influences of all these factors as an integral part of a dynamic process (Clarke, 1972:14).

    1. Physical Factors

    Physical factors that affect population distribution include altitude and latitude, relief, climate, soils, vegetation, water and location of mineral and energy resources. It is important to note that most of the physical factors influence population distribution only indirectly through climatic conditions.

    The influences of latitude and altitude on population distri­bution cannot be separated from one another. High altitude in general imposes an ultimate physiological limit upon human existence due to reduced atmospheric pressure and low oxygen content. Therefore, very few permanent settlements can be seen in the lofty mountains of the world at a height above 5,000 metres. Staszewski, in his exhaustive analysis of the vertical distribution of population, has shown that both numbers and densities in different parts of the world decline with increasing altitude.

    According to him, a little more than 56 per cent of the world’s population lives within 200 metres from the sea level, and over 80 per cent within 500 metres. However, in low latitude areas, which are otherwise hot and less favourable, high altitude provides suitable conditions for human habitation. Mountains in Africa and Latin America are much healthier than plains, and large cities have sprung up at high altitude. La Paz, the highest city in the world (3,640 m) and the capital of Bolivia, owes its existence to this factor. As against this, in the high latitude areas, it becomes extremely difficult to live beyond a few hundred metres from sea level. It is in this context that a famous population geographer has referred to “mountains that attract and mountains that repel”.

    Relief features also play an important role in influencing population distribution. The influence of altitude has already been noted. Among the other aspects of relief features which affect human habitation are general topography, slope and aspect. The main concentrations of human population are confined to the areas marked with flat topography. Rugged and undulating topog­raphy restricts the condensation of human population in any area.

    Abrupt changes in the density of population can be seen on the world map of population distribution where plains meet mountain ranges. Rising Himalayas, thus, mark the northern limit of dense population in the Ganga plain. Similarly, the Deccan plateaus with rugged and undulating topography appear distinct from the plains in respect of population concentration. In the mountainous areas valleys provide suitable locations for human settlements. Likewise, sun-facing slopes provide favourable locations for the emergence and growth of settlements.

    This is particularly true in the temperate and other high latitude areas where insolation is very important. The river valleys may promote or restrict human settle­ments depending upon other geographic conditions. In Egypt, nearly 98 per cent of the population is concentrated forming a ribbon along the Nile River. As against this, in tropical swamps and dissected plateaus, river valleys tend to repel population.

    Of all the geographic influences on population distribution, climatic conditions are perhaps the most important. Climate affects population distribution both directly as well as indirectly through its effects on soil, vegetation and agriculture that have direct bearings on the pattern of population distribution. Moreover, other physical factors like latitude and altitude also operate on population distribution through climatic conditions.

    Although climatic optima are difficult to define, extremes of temperature, rainfall and humidity certainly limit the concentration of population in any part of the earth. In the Northern Hemisphere, extreme cold conditions in the high latitude areas have prevented human habitation. Likewise, extremely high temperature and aridity in the hot deserts of the world restrict human habitability. Some of the geographers in past have, therefore, gone to the extent of claiming a deterministic relationship between climate and population distribution.

    It should, however, be noted that man has ability to adapt himself to different climatic conditions. This explains a high density in the tropics, which are otherwise marked with extremes of climatic conditions. Progress in science and technology has greatly augmented man’s ability to adapt to different climatic conditions. Though limited in magnitude, the peopling of the Alaska and Siberia during the last century owes to the scientific and technological advancements.

    The cases of Java and the Amazon basin also serve to refute deterministic stance of relationship between climate and population distribution. Though, both of them experience equatorial type of climate, they differ markedly from one another in terms of population density. While Java is one of the most densely parts of the world, the Amazon basin is marked with a very sparse population.

    Similarly, the quality of soils exerts an undeniable influence on the distribution of world population. The fertile alluvial and deltaic soils can support dense populations. Thus, most of the major concentrations of populations in the world are located in the river valleys and deltas. Great civilizations of the world have almost invariably flourished on good fertile alluvial soils. Similarly, the chernozems of steppe grasslands and rich volcanic soils can support dense population.

    On the other hand, the leached soils of temperate lands, the podsols, which are very poor in terms of fertility, can support only a sparse population. In Canada, for instance, marked difference can be noticed in population concen­tration between areas of clayey soils and podsol soils.

    It is important to note that the influence of soils cannot be viewed in isolation, that is, soils influence population distribution in associ­ation with other physical factors, mainly climate. Moreover, progress in technology can alter the effectiveness of soil types on population concentration to a greater extent. Application of modern technologies during the recent times has greatly enhanced the profitability of cultivation in many areas of the world, which were hitherto not suitable for cultivation.

    Such areas have, thus, attracted population during the recent past. In association with climatic conditions, varying soil types give rise to variety of vegetation cover on the earth surface. These, in turn, provide contrasting environment for a variety of agricultural activities, and hence, lead to different population density. Tropical forests, savanna, tundra and taiga provide different media for human occupation and concentration.

    Location of mineral and energy resources has led to dense population concentration in many parts of the world, which otherwise do not provide suitable conditions for human habitation. Large towns have grown up in inaccessible and extremely inhospitable areas such as deserts, Polar Regions or in the midst of forests where precious minerals and metals have been found.

    Kalgoorlie, a gold mining town in the Australian deserts, is a very good example in this regard. Likewise, several other examples can be cited from elsewhere in the world including Canada, the USA and Russia. Location of coal, the most important fuel in the nineteenth and early twentieth centuries was the main factor behind industrial conurbation and dense population concen­tration in Western Europe.

    However, the influence of mineral and energy resources on population distribution depends upon a wide range of social and economic factors such as market demand, capital for development, availability of labour supply and trans­portation network. It is, therefore, important to note that the influences of all the physical factors outlined above operate through a series of economic, social and political factors in the area concerned.

    1. Economic, Political and Historical Factors

    Population distribution and density in an area depends to a large extent on the type and scale of economic activities. Same geographic conditions provide different opportunities for people with different types and scale of economic activities. Technological and economic advancement can bring about significant changes in population distribution of an area. For instance, the Prairies of North America offered different opportunities for the Indians with their hunting economy, the nineteenth century ranchers, the later settled agriculturist and finally the modern industrialized and largely urbanized society.

    Each stage in economic development was marked with profound changes in population density and distribution in the region. Industrialization and discovery of new sources of minerals and energy resources have, throughout human history, brought about redistribution of population through migration. In the pre-industrial agricultural societies, population distribution often fairly evenly distributed responds to the nature of crops grown and their relationship to physical conditions.

    The industrial revolution has resulted in considerable change in population distribution in many parts of the world. Dense population concentration has replaced long established pattern of dispersal and generally even distribution. Initially, sources of energy and mineral resources became the force of industrial growth and population concentration. Improved transport network, growing spatial mobility of labour and increasing trade in the wake of economic and technological advancements have led to decline in the importance of place bound industries.

    Growing commercial activities, for instance, in the developing world, accompanied by improvements in transport network, have resulted in considerable redistribution of population and emergence of mega urban centres. It is aptly said that increasing complexity and diversification of economic activities, the world over, have led to a new pattern of population distribution.

    During the more recent times, government policies and political factors have emerged as an important determinant of population patterns. With increasing state control over economic activities, government policies have led to a significant change in the patterns of population distribution in several parts of the world. In the erstwhile USSR, facilitated by advances in science and technology, population was directed to parts of Siberian plains, which were hitherto not suitable for human habitation. Likewise, in China, planned colonization of the interior, encouraged by the communist government, has resulted in signif­icant change in population patterns.

    In the late 1960s and 1970s, some 10 to 15 million people in the country were forcibly relocated to the rural communes in order to ease pressure on urban employment. Examples of government inducements encouraging migration to new areas can be cited from several developed countries of the West as well. In addition to government policies, political events have also caused redistribution of population throughout human history.

    Wars have forced a great number of people to migrate from one region to another all over the world. Post-partition redistribution between India and Pakistan, or displacement of several million Sudanese as a result of civil war, or expulsion of Asians from Uganda in the early 1970s are some of the instances of how political events can cause changes in population patterns.

    Apart from the factors discussed above, historical processes should also be taken into account while explaining the patterns of population distribution. Duration of human settlements is an important determinant of the magnitude of population concen­tration in any area. Most of the densely populated areas of the world have a very long history of human habitation, while sparse population in certain areas can in part be explained in terms of its recent habitation.

    It should, however, not be concluded that the highest densities are always to be found in areas with the longest history of habitation. There are several instances of formerly prosperous and densely populated areas, which are now only sparsely populated. Parts of North Africa and Mesopotamia, the Yucatan peninsula and eastern Sri Lanka are some such examples. Based on this, some scholars have talked about cycle of occupation, whereby size and densities of population first increase and then decline only to be followed by another cycle of increase.

    Some Important Measures of Population Change

    Rate of Natural Increase (RNI)

    If the population is increased due to the difference of birth rate and death rate, it is called rate of natural increase (RNI). In other words, it is the difference between crude birth rate and crude death rate.

    If the birth exceeds the death (+ve RNI), the population increases and vice versa. Similarly, if the birth equals to the death, then population becomes stable (or zero rate of natural increase).

    Population Growth Rate

    The population of a country changes continuously. Birth, death and migration are the demographic elements behind the population change. Population growth rate shows either the population of a country increasing or decreasing. Population growth is the sum of RNI and net migration, it is expressed in percent.

    Sex Ratio

    Sex ratio is the ratio of males to females in a given population and usually expressed as the number of males per 100 females. It is used for expressing sex composition of thepopulation.

     

    Dependency Ratio

    The dependency ratio is measured by considering the distribution of the population by three broad groups such as 0-14, 15-59, and 60 and above. In these age groups, the age group of 0-14 and 60 above are not productive and may not be able to earn their livelihood so they should depend upon the age groups of 15-59 years. Dependency ratio shows the number of persons dependent upon every 100 people of independent groups.

    Population Doubling Time

    Population Doubling Time is the estimated time taken to double the population. The doubling time is calculated by a simple mathematical calculation. Accordingly, if a number is increased by 1 percent, in approximately 70 years, it will be doubled. If a population is growing at 1 percent per year, it takes about 70 years to double.

     

    Significance of age-sex structure of population

    The distribution of the population by sex and age is one of the most important demographic groupings. The study of theage and sex structure occupies an important place in demographicstatistics. In the first place, indices of the population’sage and sex structure play an important part in thesystem of indices of the plan for the development of the economicand cultural life of our socialist society. They are usedby planning agencies for assessing the attained level of developmentof the economy and culture of the nation and of its individualregions, for verifying the course of fulfillment of plans, as well as for current and long-term planning. These factorsengender the need to have data on the changing distribution ofthe population by sex and age, as well as similar data calculated for the future.

    Population stock refers to the composition of a population at a given point in time. While this can be broken down into many components, such as religion, marital status, ethnicity etc, demographers are primarily interested in the age-sex structure of a population. This is because the age-sex structure of a population is a fundamental determinant of the numbers of demographic events that will occur, as well as determining the types of services a population will need e.g. schools, care homes, maternity services etc.

    The age-sex structure of a population is simply the distribution of the population by age and sex. It may be described in terms of absolute numbers or percentages.

    Because of the importance of the age-sex structure as a starting point for demographic investigation, a specific way of depicting them graphically has been developed. These depictions of age-sex structures are called population pyramids. The next section will describe how a population pyramid is constructed.

    The most important demographic characteristic of a population is its age-sex structure. Age-sex pyramids (also known as population pyramids) graphically display this information to improve understanding and ease of comparison. The population pyramid sometimes has a distinctive pyramid-like shape when displaying a growing population.

    How to Read an Age-Sex Pyramid Graph

    An age-sex pyramid breaks down a country or location’s population into male and female genders and age ranges. Usually, you’ll find the left side of the pyramid graphing the male population and the right side of the pyramid displaying female population.

    Along the horizontal axis (x-axis) of a population pyramid, the graph displays population either as a total population of that age or a percentage of the population at that age. The center of the pyramid starts at zero population and extends out to the left for male and right for female in increasing size or proportion of the population.

    Along the vertical axis (y-axis), age-sex pyramids display five-year age increments, from birth at the bottom to old age at the top.

     

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