Population Graphs

What caused the population of deer to drop from year 1 to year 2?

• The deer ate each other.

• Producers became extinct.

• A wild Elsasser appeared and killed them all!

• 

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Scientists measured the spot size of all the guppies (small fish) that lived in a river 40 years ago. They measured the spot size of the guppy population again last year. When was there more variation in the spot size of guppies in the river?

• These bar graphs do not show the amount of variation in the population.

• There was the same amount of variation in spot size 40 years ago and last year.

• There was more variation 40 years ago.

• There was more variation last year.

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Which of the following statements is true based on the graph?

• Species 1 is better adapted to live with species 2

• Species 1 is better adapted to live without species 2

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Which is true according to the graph?

• Between month 1 and month 5, the population size was zero.

• Between month 4 and month 6, a predator was introduced into the ecosystem and increased the death rate.

• Between month 5 and month 7, the birth rates decreased and the death rates increased.

• Between month 8 and month 12, the population size showed a drastic decrease

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Scientists measured the spot size of guppies (small fish) in two different populations. Which population has more guppies with large spots?

• They both have the same number of guppies with large spots.

• The population in Brazil has more guppies with large spots.

• The population in Venezuela has more guppies with large spots.

• These bar graphs do not show which population has more guppies with large spots.

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Hummingbirds can have different beak lengths. They use their beaks to reach to the nectar (their food) at the bottom of flowers. Hummingbirds with longer beaks can get food from long flowers. Hummingbirds with shorter beaks cannot reach the nectar in long flowers. If a hummingbird can’t easily reach its food, it will die. The diagrams below show three possible hummingbird populations. If their environment changes to have only long flowers, which of the following hummingbird populations will most likely survive?

• Only population 2 will survive because it is the only population with variation.

• All the populations will survive because the hummingbirds will change the length of their beaks if they need to.

• Populations 1 and 2 will survive.

• Populations 2 and 3 will survive.

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Scientists measured the height of the giraffes in two different populations. Which population has the largest number of tall giraffes?

• The population in Niger has the largest number of tall giraffes.

• The population in Somalia has the largest number of tall giraffes.

• Both populations have the same number of tall giraffes.

• These bar graphs do not show which population has more tall giraffes.

What does a population graph typically represent in ecological studies?

• The number of individuals in a population over time

• The genetic diversity within a population

• The migration patterns of a population

• The food chain hierarchy in an ecosystem

Which type of population graph shows the age distribution of a population?

• Survivorship curve

• Age pyramid

• Logistic growth curve

• Exponential growth curve

In a logistic growth curve, what does the plateau phase represent?

• The population is decreasing

• The population has reached its carrying capacity

• The population is growing exponentially

• The population is extinct

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