Biology Ecology Review

Why are denitrifying bacteria important in the ecosystem?

• They absorb nitrogen from the wastes of animals

• They convert nitrogen into a form that plants can use.

• They release nitrogen from the bodies of decaying organisms to the soil.

• They release free nitrogen from nitrogen compounds back to the atmosphere.

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Cellular respiration, decomposition, combustion, and photosynthesis are processes that drive which of the following cycles in ecosystems?

• Carbon cycle

• Nitrogen cycle

• Phosphorus cycle

• Water cycle

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Which of the following statements describes a role of plants in the water cycle?

• Plants release water from their roots into the soil.

• Plants transfer water to bacteria during nitrogen fixation.

• Plants release water vapor into the atmosphere during transpiration.

• Plants convert water vapor into carbon dioxide during photosynthesis.

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What is the primary role of photosynthesis in the carbon cycle?

• releasing carbon to the oceans

• removing carbon from the atmosphere

• transferring carbon from the soil to organisms

• transferring carbon from producers to decomposers

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Grass is eaten by a prairie dog. The prairie dog is eaten by a coyote. This is an example of

• an abiotic environment

• an omivore

• a herbivore

• a food chain

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The largest population an environment can support is its

• carrying capacity

• limiting factor

• population

• symbiotic level

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Rocks, temperature, and water are what part of the environment?

• biotic

• abiotic

• population

• symbiotic factors

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What do several different populations living together make?

• a biosphere

• an organism

• a community

• an ecosystem

It has been a very harsh winter. The ground is covered in snow, and the trees are covered in ice. Many deer die because they cannot find food. This is an example of

• Producers providing food.

• a limiting factor controlling a population.

• a biosphere in trouble.

• predators harvesting the weak and the sick.

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Bears eat fruits such as berries and animals such as fish. They hibernate in the winter. They give birth to live young. Which of these terms applies to bears?

• They are decomposers.

• They are at the bottom of the energy pyramid.

• They have a mutualistic relationship with berries.

• They are consumers.

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