Energy flow in an ecosystem is

Energy flow in an ecosystem is
  a. cyclical.
  b. one-way.
  c. two-way.
  d. reversible under different conditions.
  e. dependent on the organisms in the ecosystem.

Question 2

Which of the following statements is false?
  a. Heat loss represents a one-way loss of energy from an ecosystem.
  b. Organisms in the food chain are able to utilize all the energy contained in the food that
  they eat.
  c. In some ecosystems, the majority of the energy stored in plants does not become available
  until the plants die.
  d. Heat and energy are lost by each organism in the ecosystem.
  e. The two food webs are classified as grazing and detrital.