Get premium membership and access questions with answers, video lessons as well as revision papers.
Stage I is the stage of high birth rates and death rates, and population growth is slow, but as industrialization, health care, nutrition and sanitation improve, death rates fall steadily.
Stage II is characterized by declining crude death rates and birth rates remain high for a generation or two, creating a gap between fertility and mortality that causes high growth rate. Majority of the European countries experienced this transition in the 18th, 19th and the beginning of the 20th centuries.
Stage III is the stage of declining birth rates (as a result of declining fertility rate) almost equal to death rates and the population growth rate slows down and eventually reaches near or zero growth rate. Declining fertility rates also occur due to improved education, employment standards for women and widespread adoption of family planning programmes.
Many developed countries have attained demographic transition. Developing countries, on the other hand, are trapped in stages II and III. Their death rates have declined markedly, fertility and birth rates are declining but still remain above replacement levels; hence rapid population growth in developing countries. They are caught in what is known as “Demographic Trap. The developed countries’ populations may eventually stabilize if their birth rates remain low after the transition period.
A second decline, (Stage IV) may occur in some post industrial societies, in which chronic ailments such as cardiovascular diseases, aging diseases and other degenerative diseases that account for most mortality are treated, hence improving survival. This may give rise to an additional phase of population growth (Stage V), a period of zero growth. This would be achieved if birth rate decline is accompanied by a corresponding drop in death rates. Countries such as Denmark, Sweden and Italy are experiencing this type of growth.
marto answered the question on March 20, 2019 at 11:24
- List the demographic factors influencing population growth patterns.(Solved)
List the demographic factors influencing population growth patterns.
Date posted: March 20, 2019. Answers (1)
- List the factors which led to maintenance of high fertility rates.(Solved)
List the factors which led to maintenance of high fertility rates.
Date posted: March 20, 2019. Answers (1)
- Define the term Human population .(Solved)
Define the term Human population.
Date posted: March 20, 2019. Answers (1)
- Define the term Biodiversity and Biotechnology/Genetically Modified Organisms (GMOs).(Solved)
Define the term Biodiversity and Biotechnology/Genetically Modified Organisms (GMOs).
Date posted: March 20, 2019. Answers (1)
- Briefly explain the biodiversity conservation measures in Kenya.(Solved)
Briefly explain the biodiversity conservation measures in Kenya.
Date posted: March 20, 2019. Answers (1)
- List the International Biodiversity Conservation Conventions.(Solved)
List the International Biodiversity Conservation Conventions.
Date posted: March 20, 2019. Answers (1)
- Outline the Human activities, which lead to destruction of biodiversity/living resources.(Solved)
Outline the Human activities, which lead to destruction of biodiversity/living resources.
Date posted: March 20, 2019. Answers (1)
- Briefly describe how Biodiversity is destroyed.(Solved)
Briefly describe how Biodiversity is destroyed.
Date posted: March 20, 2019. Answers (1)
- Describe the significance of Biodiversity.(Solved)
Describe the significance of Biodiversity.
Date posted: March 20, 2019. Answers (1)
- Define the term biodiversity.(Solved)
Define the term biodiversity.
Date posted: March 20, 2019. Answers (1)
- Briefly explain the two types of natural resources.(Solved)
Briefly explain the two types of natural resources.
Date posted: March 20, 2019. Answers (1)
- Outline the solutions to wetlands problems in Kenya.(Solved)
Outline the solutions to wetlands problems in Kenya.
Date posted: March 20, 2019. Answers (1)
- List the Causes of wetland problems in Kenya.(Solved)
List the Causes of wetland problems in Kenya.
Date posted: March 20, 2019. Answers (1)
- Outline the problems facing wetlands in Kenya.(Solved)
Outline the problems facing wetlands in Kenya.
Date posted: March 20, 2019. Answers (1)
- Define the term wetland.(Solved)
Define the term wetland.
Date posted: March 20, 2019. Answers (1)
- List the categories of the types of biogeochemical cycles.(Solved)
List the categories of the types of biogeochemical cycles.
Date posted: March 20, 2019. Answers (1)
- Describe Ecosystem stability models.(Solved)
Describe Ecosystem stability models.
Date posted: March 20, 2019. Answers (1)
- Define the term Consumers /heterotrophs.(Solved)
Define the term Consumers /heterotrophs.
Date posted: March 20, 2019. Answers (1)
- Define the term Primary productivity(Solved)
Define the term Primary productivity.
Date posted: March 20, 2019. Answers (1)
- Define producers /Autotrophs.(Solved)
Define producers /Autotrophs
Date posted: March 20, 2019. Answers (1)