What are the main technological drivers that have led to population growth in China s history 10

With the increase of crop varieties, since the Song Dynasty, new crops have overcome the defects of the original barren land, especially the "Champa rice", which is early, early-maturing, drought-tolerant, and fine-grained, and is suitable for the fields of high Yang, which has a certain effect on preventing drought damage in the southeast and all over the country. During the Southern Song Dynasty, the planting range was further expanded, and the east and west roads of Jiangnan and Liangzhejiang roads were particularly popular. Champa rice and late rice were combined to form double cropping rice, which greatly increased the grain yield (from the encyclopedia), and the increase in grain production reduced the pressure on people's survival and promoted the growth of the population.

The continuous evolution of labor tools, especially the application of iron farming tools in agricultural production. Iron farming tools promote the transformation of extensive agriculture to intensive farming technology system, and production tools are an important factor in productivity, the change of productivity will lead to the improvement of productivity, the improvement of human living environment, the reduction of mortality, thereby promoting population growth.

The main driving force for population growth in China's history has been the application of waterwheels. And ploughing the fields with oxen and so on!

National policy. Advances in the tools of labor production.

Example: The policy of the new China.

Example: Ancient productivity improvement (you have solved the problem of survival and have wealth, you can let go of the solution to the physiological problem).

This must be the improvement of the means of production, and then the growth of economic capacity.

Living and working in peace and contentment, agriculture is developed, and the main thing is stability.

There is no technical momentum, it is all policy-oriented. If the policy is relaxed and there is support, it will be a sudden birth.

Answer] :d The population of a city is always changing, and it is mainly affected by natural growth and mechanical growth, and the sum of the two is the growth value of the urban population. Natural increase is the net difference between the number of births and deaths.

Mechanical growth refers to the amount of change due to population migration, that is, the net difference between the population moving into the city and the population moving out of the city in a given period.

Answer] :(1) The trend of world population growth.

Looking at the growth of the world's population, the following three trends can be summarized: the absolute growth of the world's population is increasing; The rate of growth has slowed, accelerated, and then slowed down. Population growth is uneven across countries and regions of the world.

and 2) population growth in developing countries and its impact.

Huge demographic pressures in developing countries.

Developing countries are under enormous demographic pressures due to the following reasons: a since the post-war period, the living standards of the population of developing countries have initially improved, and the mortality rate has dropped significantly; b Developing countries remain agrarian countries with low levels of productivity and an objective need for an ever-increasing labour force; c The influence of traditional attitudes in developing countries is deeply entrenched and the low status of women leads to high fertility rates.

The impact of excessive population growth on the economies of developing countries.

The negative impact of excessive population growth on developing countries is multifaceted, mainly manifested in: a heavy burden on economic development; bExacerbate poverty in developing countries; c Polarization is becoming more and more prominent.

The impact of excessive population growth on the development of the world economy.

The impact of excessive population growth on the development of the world economy is multifaceted, mainly manifested in: (a) the accelerated consumption of the earth's resources, resulting in ecological imbalance and environmental pollution; b The economic gap between the North and the South has widened; c Excessive population growth in developing countries not only affects the world's sluggish economic development, but is also detrimental to world peace and stability.

and 3) the continuous decline in the birth rate of the population in developed countries and its impact.

The birth rate in developed countries continues to decline.

The decline in the birth rate and mortality rate and the extension of life expectancy determine the worldwide trend of population aging, while the decline in birth rate and mortality rate and the extension of life expectancy are the inevitable results of economic and social development. Ageing in developed countries is much worse than in developing countries.

The impact of the continued decline in the birth rate of the population in developed countries.

The continuous decline in the birth rate of the population in developed countries has led to the phenomenon of population ageing in developed countries, and population ageing has brought a series of socio-economic problems to the countries concerned, mainly including the following aspects: a aging age structure of the labor force; b Labour shortage; c The burden of social security has increased.

The answer is to shout b

The main cause of population migration is economic factors, which lead to the migration of population from developing countries to developed countries, and the population growth in developed countries is mainly mechanical growth. West Asia and Kuanchang North Africa have led to the influx of large numbers of people due to the recruitment of oil workers. Select item B.

On the one hand, when the production technology is relatively backward, the population is directly proportional to the development of the productive forces, just like the slave society, the feudal society, the country with a high level of productivity will inevitably have a large population;

On the other hand, when production technology is very advanced, population is inversely proportional to the development of productivity, because advanced technology produces the same product and requires fewer people.

This is also the reason why poor countries have more children in the current world, and rich countries have fewer children.

The faster the productive forces develop, the faster the population will grow. However, when the productive forces reach a certain stage of development, that is, in developed countries, the population growth rate will slow down, such as the United States and other developed countries. Some even have negative growth.

1. The demand for productivity for the overall economic growth of the world, especially the people as managers. 2. In the current world, the main reason for the accelerating growth rate of the world's population is: There are many backward developing countries.

Answer B: This question mainly examines the population growth of the world of excitation. Africa's natural population growth rate is the highest in the world except Antarctica, so the answer is Nigeria.

The answer should be B

The so-called mechanical growth of the population.

It is the number of people who are not born in their own country.

1.Kuwait and Germany have a low rate of natural growth, especially in Germany, which has a negative growth rate (high school textbooks specifically cite it), and it requires a large introduction of labor force, and the immigration policy is more advantageous.

2.The two countries have a good future and attract people from all over the world to immigrate.

3.Other countries have high population growth rates, overpopulation, and great pressures on employment, education, environment, transportation, housing, and public security, and policies will not be too superior.

The fact that Mexico has immigrated to the United States illegally in the United States certainly shows that its mechanical growth rate is certainly small.

aThis question examines the historical trajectory of the world's population growth. After the first technological revolution in developed countries, the mortality rate of the collapsed population decreased, and the pattern of population growth was high-low-high, and the total number of hail oak people near the source continued to increase. So choose option A for this question.

Answer C At present, the vast majority of the world's net population increase comes from developing countries, with countries such as India, China, China, Pakistan, Nigeria, Bangladesh and Indonesia accounting for half of the world's total net population increase each year. The continent with the fastest natural population growth is Africa.