Population and Resources Amplify Critical Juncture

A population of tigers lives in Bangladesh. Over 50 years, the size of the tiger population increased. What best explains the increase in the size of the tiger population?

• A lot tiger where born and none of then died

• The tiger population is always increasing because no animal eats tigers

• Fewer tigers were born than died

• More tigers were born than died

Scientists have been studying the size the three populations in the grasslands. In this ecosystem, Lizards eat fireflies, and fireflies eat gnats (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?

• 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

• 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.

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

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

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What do we call a molecule that organisms can use to release the energy needed to survive?

• energy storage molecule
• energy releasing molecule
• food storage molecule
• mitochondria

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What do we call a group of the same type of organisms living in the same area?

• population
• pollution
• community
• town

In Australia, both opossums and foxes eat rats. The sizes of the populations have been stable for the last 12 years, but recently the size of the opossum population increased. What will likely happen to the fox population?

• The larger opossum population will leave fewer ESM for all other populations in the ecosystem, so the fox population will reproduce less. This will lead to fewer births than deaths in the fox population.

• Fewer ESM will be available to the fox population from the smaller rat population, so the fox population will reproduce less. This will lead to fewer births than deaths in the fox population.

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Scientists have been studying the size of three populations in a swampland. In this ecosystem, herons (a type of bird) eat frogs, and frogs eat dragonflies. The data showed that all three populations were stable. Then the dragonfly population increased suddenly. What will happen to the frog population as a result?

• An increase in any population within an ecosystem causes and increase in the sizes of all other populations in the ecosystem.

• The larger dragonfly population will provide more ESM for the frog population, so they will reproduce more. This will lead to more births than deaths in the frog population.

• The larger dragonfly population will take more ESM from the ecosystem, leaving fewer available for the frog population. This will lead to fewer births in the frog population.

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The owl receives energy from which organisms?

• grasshopper and mouse
• mouse and rabbit
• rabbit and butterfly
• butterfly and frog

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