Exam 5: Ecosystems and Matter Cycling

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Rhizobia refers to ________.

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An underground formation of loose materials may be ________.

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Water moves through the hydrological cycle fuelled by energy from ________.

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Acid deposition is due mainly to human interference in the ________.

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The dominant limiting factor for freshwater aquatic ecosystems and for plant growth in terrestrial systems is usually ________.

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What are the two main human impacts on the carbon cycle?

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When organic wastes are added to a body of water, ________.

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Most nutrients have a large, slow-moving abiotic pool and a rapidly exchanged biotic pool.

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The elements that make up your body have undergone millions of years of recycling.

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Everything is either matter or energy.

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Eutrophication tends to increase populations of ________ at the expense of ________.

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Bacteria are an important component of the sulphur cycle because ________.

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Seventy-five per cent of the world's fresh water is held in ________.

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What is cultural eutrophication? What are the main nutrient sources contributing to it? What can we do to minimize cultural eutrophication?

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________ has/have the highest buffering capacity in terms of acid deposition.

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The largest atmospheric constituent is ________.

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Leaf decay in the tropics takes ________, while in the boreal forest it takes ________.

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Carbon dioxide gas accounts for ________ of the atmosphere.

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________ is NOT a characteristic of oligotrophic ecosystems.

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Phosphorus availability in soil is dependent on soil pH.

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