52. Ecosystems

Which of the following is NOT true concerning the flow of energy through an ecosystem?

In what direction does energy flow in a food web?

In the process of obtaining energy, what do decomposers leave behind in ecosystems?

Why is less energy available to organisms at higher trophic levels in an ecosystem?

Why are most food chains limited to three to five trophic levels?

How do food chains and food webs illustrate the transfer of energy between organisms in an ecosystem?

In the context of energy flow through ecosystems, approximately how much energy is transferred from one trophic level to the next higher trophic level?

Which of the following best describes the amount of matter that cycles through a food web in an ecosystem?

Which of the following is true about the efficiency of energy transfer in an ecosystem?

What percentage of energy is typically transferred from one trophic level to the next in an ecosystem?

Sayid drew an energy pyramid. What does each section of the triangle represent?

The movements of energy and nutrients through living systems are different because:

What is the original source of almost all the energy in most ecosystems?

Why are producers always found at the lowest trophic level in an ecosystem?

Which of the following best describes how energy flows through a food web?