Miller and Levine Chapter 5 Populations

An ecologist is a scientist who studies…

• The types of rocks and soil in an area.

• The interactions between living things and their environments.

• The phase changes of different substances.

• The life cycles of viruses and their hosts.

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What is a scientific word that refers to new organisms being made?

• Reproduce

• Renovate

• Expire

• Subsist

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Within a population, organisms are always…

• eating and sleeping.

• being born and growing up.

• being born and dying.

• dying of old age and eating other things.

What causes a population size to increase?

• The number of births is greater than the number of deaths.

• The number of deaths is greater than the number of births.

• The number of births and the number of deaths is equal.

What causes a population size to decrease?

• The number of births is greater than the number of deaths.

• The number of deaths is greater than the number of births.

• The number of births and the number of deaths is equal.

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If the population size stays stable, does this mean that no organisms have been born or died?

• Yes, because if organisms were born or died that would change the number of organisms in the population.

• No, because if some organisms are born and the same number of organisms die, then the total population size can stay constant.

• Yes, because some organisms never die, so they don't need to reproduce.

• No, because all organisms will give birth and then die.

Based on this graph, what must be true about the US honeybee population?

• There are more births than deaths occurring.

• There are more deaths than births occurring.

• There is an equal number of deaths and births occurring.

• People don't like honeybees.

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Scientists have been studying the size of three populations in a grassland. In this ecosystem, lizards eat fireflies, and fireflies eat gnats (a type of insect). The data showed that all three populations were stable. Then the lizard population decreased suddenly. What will most likely happen to the size of the firefly population as a result?

• increase. The smaller lizard population will need fewer energy storage molecules so they will eat fewer fireflies. This will lead to fewer deaths than births in the firefly population.

• increase. The smaller lizard population will leave more energy storage molecules available for the firefly population to reproduce more. This will lead to more births in the firefly population.

• stay the same. The size of its resource population did not change, so the amount of energy storage molecules available for the fireflies did not change. There will be the same number of births and deaths in the firefly population.

• decrease. A decrease in any population causes a decrease in the sizes of all other populations in the ecosystem.

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What is the term for the maximum number of individuals of a particular species that a particular environment can support?

• Carrying capacity

• Population density

• Limiting factor

• Biotic potential

Which of the following is a density-dependent factor that affects population growth?

• Natural disasters

• Disease

• Climate

• Sunlight

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