OBJECTIVE FORESTRY

Detailed explanation-1: -As you move up the pyramid, through the trophic levels to primary, secondary and tertiary consumers, the amount of energy decreases and the levels become smaller. While energy can not be created or destroyed is it released as heat within each level. Approximately only 10% of energy is passed from one level to the next.

Detailed explanation-2: -Energy decreases as it moves up trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level.

Detailed explanation-3: -Energy is transferred up the pyramid because each organism is consumed by the one above it. The amount of energy available decreases at each trophic level because the transfers are not 100% efficient as only 10% energy is transferred from one trophic level to another.

Detailed explanation-4: -The flow of energy in the ecosystem is unidirectional because the energy lost as heat from the living organisms of a food chain cannot be reused by plants in photosynthesis.