At the trophic level of consumers, the rate at which food energy is assimilated, is called:

1. Secondary productivity

2. Gross primary productivity

3. Net primary productivity

4. None of these

Subtopic:  Ecosystem Productivity |
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The term "detritivore" includes
1. decomposers
2. primary consumers
3. secondary consumers
4. autotrophs

Subtopic:  Decomposition |
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Net primary productivity is the gross primary productivity less

1. that which is consumed by herbivores

2. that which is consumed by producer in metabolism

3. secondary productivity 

4. loss due to mortality

Subtopic:  Ecosystem Productivity |
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The major reservoir for phosphorous is 

(1) Aquifers

(2) Soil and rocks

(3) The atmosphere

(4) Clouds

Subtopic:  Mineral Cycling & Ecosystem Services |
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Which of the following pyramids can never be inverted in a natural ecosystem?

1. pyramid of numbers

2. pyramid of energy

3. pyramid of biomass

4. all can be inverted 

Subtopic:  Ecological Pyramids |
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The earth is an open system with respect to

1. organisms

2. chemicals

3. energy 

4. all of the above

Subtopic:  Energy Flow |
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Plants capture approximately __________________ of the sun's energy while other trophics levels capture about _________________ of the energy available to them in their food.

1. 1%, 10%

2. 10%, 60%

3. 10%, 1%

4. 60%, 10%

Subtopic:  Energy Flow |
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Which trophic level is incorrectly defined?

1. Carnivores- secondary or tertiary consumer

2. Decomposer- microbial heterotrophs

3. Herbivores - primary consumer

4. Omnivores - Molds, yeast and mushrooms

Subtopic:  Energy Flow |
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Nitrogen gas makes up nearly 80% of Earth's atmosphere, yet nitrogen is often a limiting factor for plant growth. Why ?
1. The atmospheric form of nitrogen cannot be used by plants.
2. Nitrifying bacteria remove usable nitrogen from the soil more repidly than plants can absorb it.
3. Atmospheric nitrogen dissolves readily in the soil but is washed out with every rainfall.
4. Plants must absorb nitrogen through their roots, which are not in contact with the atmosphere.

Subtopic:  Mineral Cycling & Ecosystem Services |
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In general, the biomass in an ecosystem will be greatest at the trophic level comprising.

1. secondary consumers

2. primary consumers

3. producers

4. tertiary consumers

Subtopic:  Ecological Pyramids |
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