Discuss the major components of population growth

• Alemannisch • العربية • বাংলা • Български • Català • Deutsch • Eesti • Español • Esperanto • Euskara • فارسی • Français • ગુજરાતી • 한국어 • हिन्दी • Hrvatski • Bahasa Indonesia • Italiano • Kurdî • Malagasy • മലയാളം • Bahasa Melayu • Nederlands • नेपाली • Norsk bokmål • Oʻzbekcha / ўзбекча • پنجابی • پښتو • ភាសាខ្មែរ • Português • Русский • Seeltersk • Sesotho sa Leboa • Simple English • کوردی • Suomi • Svenska • Türkçe • Українська • اردو • Tiếng Việt • Walon • 中文 Population growth is the increase in the number of people in a World human population has been growing since the end of the Population growth alongside Population Years passed Year Pop. (billions) – 1800 1 127 1927 2 33 1960 3 14 1974 4 13 1987 5 12 1999 6 12 2011 7 11 2022 8 14 2037* 9 18 2055* 10 33 2088* 11 *World Population Prospects 2017 (United Nations Population Division) History [ ] Main article: Due to its dramatic impact on the human ability to grow food, the Thomas McKeown hypotheses [ ] Some of the reasons for the "Modern Rise of Population" • McKeown stated that the growth in Western population, particularly surging in the 19th century, was not so much caused by an increase in • The decline of mortality could largely be attributed to rising standards of living, whereby McKeown put most emphasis on improved nutritional status, • McKeown questioned the effectiveness of public health measures, including sanitary reforms, vaccination and quarantine, • The “McKeown thesis" have stated that Although the M...

There are three major components of population growth which are as follows: (i) Birth rate is a major component of population growth because in India, birth rate has always been higher than death rate, and it is the number of live births per thousand persons in a year. (ii) The second main cause of the rate of growth of the Indian population has been the rapid decline in death rates; it is the number of deaths per thousand persons in a year. Till 1980, high birth rates and declining death rates led to a large difference between birth rates and death rates resulting in higher rates of population growth. (iii) The third major component of population growth is migration, which is movement of people across regions and territories; there can be two types of migration internal and international. Internal migration does not change the size of population, but influences the distribution of population within the nation; it plays a vital role in changing the composition and distribution of population.

Class 9 Geography Chapter 6 Population Important Questions Class 9 Social Science Geography Chapter 6 Population important questions and answers cover the major concepts of the chapter. Solving answers of these important questions help students to revise the Chapter most competently. We prepared these questions with PDF as per the latest NCERT book and CBSE syllabus. Practising these questions before the exam will ensure excellent marks in the exam. Population Class 9 Important Questions and Answers 1. Describe the distribution of the population in India. Answer: (a) The population of India, as on March 2011, stood at 1,210.6 million. These 1.21 billion people are unevenly distributed over 3.28 million square km. (b) The population is divided into Very densely population—Uttar Pradesh, Maharashtra, Bihar, West Bengal, Andhra Pradesh. Very sparsely population—Sikkim Lakshadweep, Rajasthan, Arunachal Pradesh. Moderately population—States like Assam and Peninsular states. (c) The dense population is due to fertile, flat land and favourable climate. On the other hand, hilly areas or regions with low rainfall do not allow people to settle there. 2. What were the causes of the uneven population in India? Answer: The population of India is unevenly distributed in India because of the following reasons: (a) Relief of the land: Where there are mountain s and rugged relief the population is sparse. Flat and fertile land favours the population density. (b) Climate: Fewer people live ...

Population Growth Rate Population growth rate ( r) is how fast a population changes in size over time. A positive growth rate means a population is increasing. A negative growth rate means it is decreasing. The two main factors affecting population growth are the birth rate ( b) and death rate ( d). Population growth may also be affected by people coming into the population from somewhere else ( immigration, i) or leaving the population for another area ( emigration, e). The formula for population growth takes all these factors into account. r = ( b + i) - ( d + e) • r = population growth rate • b = birth rate • i = immigration rate • d = death rate • e = emigration rate Dispersal Other types of movements may also affect population size and growth. For example, many species have some means of dispersal. This refers to offspring moving away from their parents. This prevents the offspring from competing with the parents for resources such as light or Figure Dandelion Seeds. These dandelion seeds may disperse far from the parent plant. Why might this be beneficial to both parents and offspring? Migration Migration is another type of movement that changes population size. Migration is the regular movement of individuals or populations each year during certain seasons. The purpose of migration usually is to find food, mates, or other resources. For example, many northern hemisphere birds migrate thousands of miles south each fall. They go to areas where the weather is warmer an...

Skills to Develop • Discuss how human population growth can be exponential • Explain how humans have expanded the carrying capacity of their habitat • Relate population growth and age structure to the level of economic development in different countries • Discuss the long-term implications of unchecked human population growth Concepts of animal population dynamics can be applied to human population growth. Humans are not unique in their ability to alter their environment. For example, beaver dams alter the stream environment where they are built. Humans, however, have the ability to alter their environment to increase its carrying capacity sometimes to the detriment of other species (e.g., via artificial selection for crops that have a higher yield). Earth’s human population is growing rapidly, to the extent that some worry about the ability of the earth’s environment to sustain this population, as long-term exponential growth carries the potential risks of famine, disease, and large-scale death. Although humans have increased the carrying capacity of their environment, the technologies used to achieve this transformation have caused unprecedented changes to Earth’s environment, altering ecosystems to the point where some may be in danger of collapse. The depletion of the ozone layer, erosion due to acid rain, and damage from global climate change are caused by human activities. The ultimate effect of these changes on our carrying capacity is unknown. As some point out, it...