Problem 9 - Campbell Biology

Question

Level \(2 :\) Application/Analysis Which of the following statements about human populations in industrialized countries is incorrect? (A) Birth rates and death rates are high. (B) Average family size is relatively small. (C) The population has undergone the demographic transition. (D) The survivorship curve is Type I.

Step-by-Step Solution

Answer

Statement (A) is incorrect.

Step 1: Understanding Birth and Death Rates

In industrialized countries, birth rates and death rates are generally low due to better healthcare, family planning, and economic stability. Statement (A): Birth rates and death rates are high, is likely incorrect.

Step 2: Analyzing Family Size

Industrialized countries typically have smaller family sizes due to lifestyle choices and economic factors. Hence, statement (B): Average family size is relatively small, is correct.

Step 3: Demographic Transition

Industrialized countries have experienced the demographic transition, which includes a shift from high birth and death rates to low birth and death rates. Therefore, statement (C): The population has undergone the demographic transition, is correct.

Step 4: Understanding Survivorship Curves

In industrialized countries, with better healthcare and living conditions, the survivorship curve is typically Type I, indicating low infant mortality and high survivorship until older age. So, statement (D): The survivorship curve is Type I, is correct.

Step 5: Identifying the Incorrect Statement

Based on the analysis, the incorrect statement about human populations in industrialized countries is statement (A): Birth rates and death rates are high.

Key Concepts

birth rates

Birth rates refer to the number of live births per thousand people in a given year. In industrialized countries, birth rates are generally low. This is primarily due to factors such as better access to contraception, more career-oriented lifestyles, and higher education levels. These factors influence individuals and couples to have fewer children. Lower birth rates are also associated with improved healthcare systems, meaning fewer children are required for family support and economic reasons.

death rates

Death rates are the number of deaths per thousand individuals per year. In industrialized countries, death rates are also typically low. This is largely a result of advanced healthcare, better living conditions, and widespread access to medical services. Vaccinations, modern medical treatments, and a focus on preventive care significantly contribute to decreased mortality rates. Improved sanitation and higher living standards further reduce the incidence of life-threatening diseases and conditions.

average family size

The average family size in industrialized countries tends to be relatively small. Economic factors, career aspirations, and access to family planning services play significant roles in this trend. Smaller family sizes often reflect a deliberate choice to provide better quality of life and greater resources to fewer children. Additionally, the cost of raising children, as well as societal norms and expectations, contribute to the decision to have fewer offspring.

demographic transition

Demographic transition is a model that describes population change over time from high birth and death rates to low birth and death rates. In industrialized countries, this transition has been complete. This shift is associated with industrialization, which brings about better living standards, improved medical care, and changes in societal behavior. The process typically involves four stages:

• Preindustrial: High birth and death rates.
• Transitional: Death rates drop while birth rates remain high.
• Industrial: Both birth and death rates decline.
• Postindustrial: Very low birth and death rates.

The transition results in stabilized population growth, often with potential declines in some regions.

survivorship curves

Survivorship curves illustrate the number of individuals from a cohort that survives to various ages. In industrialized countries, the survivorship curve is typically Type I. Type I curves are characterized by low infant mortality and high survival rates unto older age. This is indicative of environments with excellent healthcare, ample resources, and stable living conditions. Most individuals in such populations tend to live to old age, experiencing higher mortality rates only in the later stages of life.