52. Ecosystems

Which organisms are considered the most important transformers of energy in ecosystems?

Which of the following sequences best represents the flow of energy through living systems?

In the context of energy flow through ecosystems, what percentage of energy is typically transferred from one trophic level to the next?

An ecological pyramid can depict the flow of which of the following between successive trophic levels?

From the producer level, to which trophic level does energy flow directly in an ecosystem?

What is the first step in energy flow through an ecosystem?

Which of the following statements is true about the energy flow in an ecosystem?

In the context of energy flow through ecosystems, what is the primary role of nutrients?

What is represented by a biomass pyramid in an ecosystem?

What is the term for each step in the transfer of energy and matter within a biological community?

Within an ecosystem, the gross primary productivity (GPP) is always greater than the net primary productivity (NPP). Which of the following correctly fills in the blanks: "Within an ecosystem, the _____ is always greater than the _____"?

Why do quaternary consumers typically occupy the top position in the pyramid of energy within an ecosystem?

In a typical food pyramid, what percentage of the original solar energy is available to a blackberry plant (a primary producer)?

What is an energy source for the producers in an ecosystem?

Why are food chains typically limited to a maximum of five trophic levels?