AP Biology Ecology

Why does increasing producers increase the populations of all trophic levels?

• Producers increase the size of a habitat

• Producers help keep predator populations in check

• With more energy available the carrying capacity increases

• Producers do not have a large impact on population sizes

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What causes trophic cascades?

• Increasing the number of producers

• Pollution

• The removal of a keystone species

• Introducing a new species to an ecosystem

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If the producer level of an ecosystem has 750,000 J of energy, how much energy would be passed on to the secondary consumers?

• 75,000 J

• 7,500 J

• 750 J

• 75 J

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Which of these describes a mutualistic relationship?

• When one organism is harmed, but the other is benefitted

• When one organism is unaffected, and the other is harmed

• When one organism benefits, and the other is unaffected

• When both organisms involved benefit

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A deceased body was found in the snow this will cause a ​ (a)   insect activity, and in the decomposition process.

• decrease

• increase

• not effect

• speed up

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Secondary succession begins

• on bare, exposed rock.

• after a disturbance like a wildfire.

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Blackspot fungus does not grow on roses when there is a large amount of sulfur dioxide in the atmosphere. This fungus serves as a _____

• secondary messenger

• bioindicator

• keystone species

• eco-service

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What will happen if two species occupy the same niche in an ecosystem?

• The ecosystem will be stressed and could collapse

• One species will either alter their niche or be eliminated

• The niche will expand to accommodate both species

• The species will share the niche

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Why are decomposers necessary in ecosystems?

• They recycle essential nutrients back down to producers

• They enrich soil with nitrogen

• They help keep ecosystems clean

• All of the above

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How do invasive species impact ecosystems?

• The increase density dependent limiting factors

• They establish themselves as new keystone species in an area

• The open up new niches in the ecosystem

• They outcompete native species and overpopulate the area

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