Population Change

Why do the populations of invasive species grow so quickly? 

• Invasive Species are native to an area. 

• Invasive species are prey to many animals.

• Invasive species have no predators.

• Invasive species keep the ecosystems in equilibrium.

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Click on the map to help answer this question: What can we predict about the population of Feral Swine for the year 2016?

• There will be less feral swine in 2016 than there were in 1982.

• There will be more feral swine in 2016 than there were in 2010

• There were fewer feral swine in 2004 than 1982.

• There will be no change in feral swine population.

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Invasive species grow quickly due to the lack of predators, this leads to a decline or extinction of the native population. True or false? 

• false

• true

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A population of panthers lives in the southeastern United States. Over 50 years, the size of the panther population in the region increased. What best explains the increase in the size of the panther population?

• The panther population is always increasing because no animal eats panthers.

• Fewer panthers were born than died.

• More panthers were born than died.

• A lot of panthers were born and none of them died.

A population of deer lives in Canada. Over 50 years, the size of the deer population decreased. What best explains the decrease in the size of the deer population?

• A lot of deer died and no deer were born.

• Fewer deer were born than died.

• The deer population is always decreasing because deer are always being eaten.

• More deer were born than died.

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A large population of squirrels lives in a forest. In the last 50 years, the size of the squirrel population has stayed the same. What must be true about the squirrel population during the last 50 years?

• The number of squirrels that were born was the same as the number of squirrels that died.

• Humans started protecting the squirrel population so they stopped dying.

• The squirrels did not have any baby squirrels during these years.

• No squirrels were born and no squirrels died.

In a rainforest, both spiders and frogs eat flies. The sizes of the populations have been stable for the last 10 years, but recently the size of the frog population decreased. What will likely happen to the spider population?

• increase. The smaller frog population will leave more food for all other populations in the ecosystem, so all populations will reproduce more. This will lead to more births in the spider population.

• increase. More food will be available to the spider population from the larger fly population, so the spider population will reproduce more. This will lead to more births than deaths in the spider population.

• stay the same. Frogs and spiders do not eat each other, so the number of births and deaths in the spider population will stay the same.

• decrease. A decrease in the size of one population leads to a decrease in the sizes of all other populations in an ecosystem.

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What are the effects on the plant, deer and rabbit if large number of wolves enter the habitat?

• The plant decrease, the deer and rabbit increase

• The plant increase, the deer and rabbit decrease

• The plant decrease, the deer and the rabbit decrease too

• The plant increase, the deer and rabbit increase too

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Based on the diagram given, what will happen to the number of rats in this oil palm estate if all the snakes are killed by the farmer?

• Number of rats will increase

• Number of rats will decrease

• Number of rats will remain the same

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Based on the food web given, predict what will happen if the deer and the mouse deer in the habitat become extinct due to hunting.

• Tiger increases and phython decreases

• Tiger and phython decrease

• Tiger and phython increases

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