Problem 14 - Biology Concepts and Applications

Question

The demographic transition model predicts a decline in population during the________ stage. a. preindustrial b. transitional c. industrial d. postindustrial

Step-by-Step Solution

Answer

The demographic transition model predicts a decline in population during the postindustrial stage (d).

Step 1: Understanding the Demographic Transition Model

The Demographic Transition Model (DTM) is a theoretical model that describes population change over time, moving through four or five stages as a country develops economically and socially. These stages are: Preindustrial, Transitional, Industrial, and Postindustrial (sometimes a fifth stage is added for further decline or stabilization).

Step 2: Identifying Population Trends Across Stages

In the Preindustrial stage, both birth and death rates are high, so population growth is slow. In the Transitional stage, death rates decline due to improvements in healthcare and sanitation, while birth rates remain high, leading to rapid population growth. During the Industrial stage, birth rates start to decline due to changes such as increased access to contraception and urbanization, leading to slower population growth. In the Postindustrial stage, both birth and death rates are low, and population growth slows, stabilizes, or even begins to decline.

Step 3: Associating Population Decline with the Stage

Population decline typically occurs in the Postindustrial stage when birth rates drop below death rates, leading to a decrease in the overall population. This is due to factors like an aging population, higher costs of raising children, and societal shifts towards smaller family sizes.

Step 4: Selecting the Correct Answer

Based on the understanding from previous steps, the Postindustrial stage is where a decline in population is predicted to occur, as birth rates fall below death rates.

Key Concepts

Population Decline

Population decline happens when the number of people dying exceeds the number of people being born, causing the total population to decrease. In modern societies, this decline is becoming a common feature in postindustrial stages. Why does this occur? There are several contributing factors:

• Increased life expectancy leads to a higher proportion of older individuals. As more people live longer, there are fewer younger people being born to replace them.
• The cost of raising children has become more expensive, leading many families to opt for fewer children.
• Societal changes have adjusted family size expectations and norms, often favoring smaller family units.
• Access to education and family planning means people are choosing to have fewer children and at later ages.

These elements collectively contribute to a situation where the birth rate can fall below the death rate, resulting in a decline in population.

Postindustrial Stage

The postindustrial stage is characterized by low birth and death rates. It follows the completion of the industrial stage, where economic factors are strong enough to maintain societies without relying on high birth rates.
Understanding the postindustrial stage is crucial for grasping how economies and societies evolve over time. In this stage:

• The economy becomes more service-oriented, with less dependence on manufacturing and agriculture.
• Technological advancements and better healthcare options are common, contributing to low mortality rates.
• Urbanization reaches its peak, with most of the population living in cities.
• Social structures change, accommodating extended education and career expansion, which delays family formation.

The postindustrial stage can lead to challenges such as an aging population and a shrinking workforce, albeit with increased productivity driven by technology.

Population Growth Stages

The demographic transition model illustrates how populations grow and change over time through different stages, each marked by distinct patterns of birth and death rates.

• Preindustrial Stage: High birth and death rates balance each other, resulting in slow or stable population growth. Societies at this stage are usually deeply reliant on agriculture.
• Transitional Stage: Death rates decline due to improvements in healthcare, while birth rates remain high, causing rapid population growth. Economic developments begin to take shape.
• Industrial Stage: Birth rates start to decline due to urbanization, increased education, and better access to contraception, which slows population growth.
• Postindustrial Stage: Both birth and death rates are low. Population growth stabilizes or even decreases, marking a shift towards modern, service-driven and technology-oriented societies.

Understanding these stages helps us predict demographic trends and challenges that may arise as societies evolve.