Ecosystems 8th grade review

Bobcats rely on chipmunks for their food. What would happen to chipmunks if bobcats were removed from their environment?

• The chipmunk population would grow, and start competing for food

• Chipmunks would be larger and stronger animals

• An increase in diseases would cause the chipmunk population to die out

• Chipmunks would change colors because they no longer have to hide from bobcats.

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How are mutualism and parasitism similar?

• Both organisms benefit in parasitism mutualism.

• Both organisms are harmed in parasitism and mutualism.

• One organism is harmed in parasitism, and both organisms benefit in mutualism.

• Only one organism benefits in mutualism whereas both organisms benefit in parasitism.

Which would have the greatest LONG TERM impact on reducing carbon dioxide in the air?

• planting trees on a farm

• cutting down trees on a farm

• increasing the number of livestock on the farm

• decreasing the number of livestock on the farm.

Answer explanation

Trees use CO₂ in the air. Since trees are able to live longer than livestock (cows) this will be a greater LONG TERM effect.

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Which would most likely increase the genetic variation in a population of organisms?

• an increase in diseases

• a decrease in mutations

• an increase in mutations

• a decrease in diseases

Answer explanation

Mutations occur when offspring (babies) have a genetic difference in them (such as a clover having 4 leaves instead of 3). Those genetic differences can be passed on to more generations.

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What is the primary source of energy for most cells in the human body?

• proteins

• sugars

• fats

• vitamins

Answer explanation

Animals get their energy from plants, which get their energy through photosynthesis. This process creates sugars (you have probably heard that carbohydrates or carbs give you energy-carbs are made of sugars).

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• The Questors will compete with Wood Plaxers for food.

• The questors will be forced to fly to a new habitat.

• Both species pf birds will become extinct.

• The species will be able to coexist without any competition.

Answer explanation

Small seeds are different from large berries, and there are many flying insects for the Questor to eat allowing the Wood Plaxor to eat the beetles.

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What happens to most energy as it goes through a food web?

• It changes to heat.

• It is lost to decomposers.

• It is changed into light energy.

• It changes mass.

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Which example demonstrates how genetic variation may result from a change in the environment in which the animal lives?

• A salmon swims faster as it enters colder water.

• A snake increases its body temperature after sitting on a rock in the sun.

• A beetle stands out to predators because it moves among plants that have colors different than its own.

• An arctic fox changes its color over time because it migrates to an area with a different climate.

Answer explanation

Genetic variations take place SLOWLY, OVER TIME.

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Where do plants get the food they need for energy?

• They absorb it directly from the sun.

• They absorb it from the soil.

• They produce it through photosynthesis

• They receive it from atmospheric gases.

Answer explanation

Plants use sunlight and carbon dioxide to MAKE energy.

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Which action shows concern for the environment with regards to the resources of the oceans?

• developing technology which will allow for an increase in fish harvesting

• allowing factories to release untreated wastewater into the oceans

• filling in oceanfront wetlands in order to extend beachfront properties

• setting limits on fish harvesting in the oceans

Answer explanation

If too many fish are harvested (fished) then the entire food web will be impacted.

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