Behaviour, Populations & Environment

Population & Demographic Trends

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1) When a population colonises a favourable new environment, its number increases in .

2) The maximum size of a population that can be supported by a particular environment is called its .

3) The carrying capacity of an environment is determined by limiting factors such as available food supply, and space which exert a effect on the population.

4) Humans have increased the carrying capacity of their environment by producing vast amounts of and improving public which in turn have reduced child and increased life . This has led to the human population changing form a period of stability to one of exponential growth.

5) The first population spurt began about 10 000 years ago when humans began to practise ; the second began around 1650 AD when great advances in scientific understanding led to the revolution.

6) Examples of pre-industrial cultures exist in many developing countries and a few examples of pre-agricultural cultures survive amongst societies.

7)A change in a country's population size is called a trend. It is affected by and death rates, and immigration and rates.

8) The demographic model tries to relate rate of human population growth to cultural development. It suggests that as a developing country becomes it passes through four demographic stages from stable to to late expanding to .

9) A population represents the structure of a population with respect to the age and of its members. It is useful as a predictor of future needs of a population. The population pyramid of a developing country is broad-based whereas that of a developed country is .

10) If the human population continues to increase , a new carrying capacity will be reached and certain factors such as food and clean water will become . Such a disaster may be averted if population through birth rate reduction is adopted worldwide.