Ch 9 The Human Population

In an ecosystem, which is NOT a density-
dependent limiting factor?

• competition
• parasitism
• predation
• natural disaster

If a population grows larger than its environmental carrying capacity, then

• death rate may rise.
• death rate may fall significantly.
• birth rate may rise significantly.
• immigration rate may increase.

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Science discoveries and technological advances have allowed the population of the Earth to grow exponentially with no end of the growth in sight. Which statement best describes how these advancements are detrimental to the Earth?

• Society is learning new and more Earth friendly means of creating energy.
• Scientists are learning ways for people and animals to coexist in harmony.
• Society is learning new ways to replenish resources that we have nearly used up.
• The growing population is taxing Earth's resources which could lead to the extinction of many species.

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During the past 100 years, the growth in human populations in the urban areas of industrialized nations has greatly contributed to all BUT one of these environmental problems. That is

• species extinction.
• deforestation.
• water contamination.
• increased carbon dioxide emissions.

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NGSS.HS-ESS3-1

Which statement about human population growth is LEAST likely to be correct?

• Modern medicine has allowed human populations to extend well past the earth's carrying capacity, as more people survive for longer.
• Technological advances in farming and medicine will allow human populations to continue to grow without natural limits.
• Advances in agriculture have allowed the world's food supply to expand dramatically in the last 100 years.
• Worldwide, humans are reproducing more quickly than mortality is removing people from the population.

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All but one of the factors listed is a major contributor to world population increases. That factor is

• increased birth rate.
• increased immigration to foreign countries.
• decreased death rate.
• an increase in the quality of medical care.

Increased food supplies in an ecosystem decrease competition because the competing organisms would

• reproduce more often.
• have more space in which to live.
• have enough food to eat.
• store large quantities of food.

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Which is the best indicator of a population's health and nutritional status?

• number and causes of death
• number of healthy-weight infants
• number of low-birth weight infants
• number of government food programs

 What does the term carrying capacity describe?

• The maximum number of birth rates for a population.
• The ability of a population to accept new immigrants.
• The ratio of birth rates to death rates in a population.
• The population size that the environment can sustain.

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NGSS.HS-LS2-1

How does an increase in population density impact the spread of infectious disease?

• as population density increases, spread of infectious disease decreases
• as population density decreases, spread of infectious disease decreases
• as population density decreases, spread of infectious disease increases
• as population density increases, spread of infectious disease increases