Ecosystems Quiz Bowl 2024

The diagram shows an aquatic food web. The population of shrimp is reduced due to a sudden change in the climate. Does this decrease have any effect on the population of alligators?

• Yes. The alligator feeds on shrimp when other food sources are unavailable.

• No. The alligator is the top predator and will be unaffected by the decline of shrimp.

• Yes. The population of catfish and pike that are food for the alligator will decrease.

• No. The population of organisms on which the alligator feeds would remain the same.

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The diagram shows a grassland ecosystem. The grasshopper population decreases due to disease. What change would most likely be observed in the populations of the beetles and snails and why?

• They will decrease, as they will feed upon each other.

• They will increase, as the owl population will feed on more of the shrew and wood mouse populations.

• They will decrease, as the wood mouse and shrew populations will feed on more of them.

• They will increase, as there will be more of the green plant population for them to feed upon.

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What explains the immediate effect of removing the elk population from the ecosystem?

• The population of the lion will increase.

• The population of the bat will decrease.

• The population of the deer will decrease.

• The population of the wolf will increase.

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Scientists have discovered an increase in the amount of green algae growing in Lake Waccamaw. How will the increase in the green algae population benefit the fish population of the lake?

• The green algae will provide more shelter for the fish.

• The green algae will provide more food for the fish.

• The green algae will create more space at the top of the lake for the fish.

• The green algae will decrease the number of predators that eat the fish.

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The diagram shows a food web. Which organism will be affected the least by the removal of the mouse from the food web?

• cougar

• insects

• shrew

• snake

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The image shows a desert food web. A population of owls moves into the region. These owls depend on herbivores for food. Which organisms will be the most likely food source for the owls?

• cacti

• hawks

• rattlesnakes

• wood rats

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The diagram shows a food chain of the Pacific Ocean. Which statement correctly explains the effect of a decrease in the number of sea otters on the food chain?

• There would be a significant decrease in the population of sea urchins and kelp.

• There would be a significant increase in the population of sea urchins and kelp.

• There would be a significant increase in the population of sea urchins and a decrease in the population of kelp.

• There would be a significant increase in the population of kelp and a decrease in the population of sea urchins.

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The diagram shows a food web of a grassland ecosystem. What type of change in the rabbit population will be observed if the population of roadrunners decreases?

• The population of rabbits will increase, as coyotes would not feed on rabbits in the absence of roadrunners.

• The population of rabbits will decrease, as it would be the only food for coyotes in the absence of roadrunners.

• The population of rabbits will decrease, as rattlesnakes will feed on more grasses reducing the food for rabbits.

• The population of rabbits will increase, as hawks will feed on more rattlesnakes reducing the predators of rabbits.

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The diagram shows a food web. Which change is least likely to affect the population of mice?

• an increase in the population of owls

• an increase in the population of foxes

• a decrease in the population of grains

• a decrease in the population of grasshoppers

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What is the main difference between a grassland and a forest ecosystem?

• The amount of trees in a forest is greater than in a grassland

• The amount of trees in a grassland is greater than in a forest.

• The amount of salt water in a forest is greater than in a grassland.

• The amount of salt water in a grassland is greater than in a forest.