Unit 2.8- Energy Flow and Biogeochemical Cycles

Multiple Choice

How are biogeochemical cycles and energy flow connected in ecosystems?

• Biogeochemical cycles recycle elements needed for energy flow and growth.

• Energy flow and biogeochemical cycles are completely separate processes.

• Energy flow recycles elements, while biogeochemical cycles do not.

• Biogeochemical cycles only affect non-living things.

Multiple Choice

Which of the following best describes the flow of energy in an ecosystem?

• Energy moves from the sun to plants, then to animals, and is lost as heat at each step.

• Energy is created by animals and moves to plants.

• Energy flows from decomposers to the sun, then to plants.

• Energy is only transferred between animals.

Multiple Choice

Which of the following elements is NOT typically cycled through biogeochemical cycles?

• Carbon

• Nitrogen

• Phosphorus

• Gold

Multiple Select

Which of the following are possible effects of human activities on biogeochemical cycles and energy flow?

• Cutting down trees can disrupt natural cycles.

• Using too much fertilizer can harm aquatic life.

• Burning fossil fuels has no effect on cycles.

• Excess nitrogen and phosphorus can hurt fish and plants.