B4 Population

Open Ended

Why is it important to understand the factors that affect population growth in an ecosystem?

Multiple Choice

Which of the following best describes a population in the context of organisms and their environment?

• A group of organisms of one species living in the same area at the same time

• All the populations of different species in an ecosystem

• A unit containing the community of organisms and their environment

• A group of different species living in different areas

Open Ended

Why doesn't the greenfly population shoot upwards like this? Why isn't the world overrun with greenfly?

Open Ended

Explain how the study of population changes in yeast and bacteria can help us understand human population growth.

Fill in the Blanks

If birth rate and death rate are equal, the population will stay the

size.

Multiple Choice

Which factor is most responsible for keeping the greenfly population from increasing uncontrollably?

• High birth rate

• High death rate

• Migration

• Availability of food

Multiple Choice

What might happen to the yeast population if the nutrient broth is not replenished during the experiment?

• The population will continue to grow indefinitely

• The population will decrease after reaching a peak

• The population will remain constant

• The population will die out immediately

Multiple Choice

Which phases are shown in the yeast population growth curve?

• Lag phase, exponential phase, stationary phase, death phase

• Lag phase, exponential phase, decline phase, stationary phase

• Growth phase, decline phase, stationary phase, lag phase

• Exponential phase, lag phase, stationary phase, growth phase

Multiple Choice

Which phase of population growth is characterized by slow growth due to cells adjusting to new conditions?

• Lag phase

• Log phase

• Stationary phase

• Death phase

Open Ended

Explain the significance of the stationary phase and death phase in the population growth of yeast.

Fill in the Blanks

A limiting factor is the factor that limits the rate of population growth even if everything else would allow it to

.

Multiple Select

Which of the following are considered limiting factors in population growth?

• Food supply

• Predation

• Disease

• All of the above

Multiple Choice

When the snowshoe hare population rises, what happens to the lynx population shortly afterwards?

• It rises

• It falls

• It stays the same

• It fluctuates randomly

Open Ended

Based on the graph, what is the relationship between the population sizes of snowshoe hares and lynx over time?

Multiple Choice

What is the main purpose of drawing an age pyramid when studying a population?

• To measure the birth rate and death rate

• To count the number of individuals in various age groups at one point in time

• To predict future population growth

• To compare populations of different countries

Open Ended

Compare the characteristics of an increasing population and a stable population as shown in the age pyramids.

Fill in the Blanks

The human population in France is staying about the

size.

Multiple Select

Which of the following statements are true about bottom-heavy age pyramids?

• They indicate a higher birth rate than death rate

• They are common in developing countries

• They show a stable population

• They represent populations that are increasing

Open Ended

Explain how improvements in agriculture have affected the human population growth.

Multiple Select

Which of the following factors have contributed to the reduction of disease and increase in human population growth?

• Improvements in water supply

• Hygienic food handling

• Increase in food supply

• Decrease in agricultural efficiency

Open Ended

Reflecting on today's lesson about populations and ecosystems, what is one question you still have or something you would like to learn more about?

Multiple Choice

What is one factor that affects the rate of population growth in an ecosystem?

• Food supply

• Sunlight

• Wind speed

• Rock type