7 Science--Lesson 1 (Matter & Energy in Ecosystems)

Which of the following flows through ecosystems in one direction?

• carbon

• energy

• nitrogen

• water

In what form is energy that is NOT used for life processes released from living things?

• light

• sound

• thermal

• chemical

Elements such as oxygen, nitrogen, and carbon cycle through a system once

• True

• False

Nitrogen, as it is found in the atmosphere, can be used by plants and animals.

• True

• False

Which of the following does NOT move continuously through ecosystems?

• water

• aluminum

• energy

• nitrogen

Which of the following is NOT part of the water cycle?

• nitrogen fixation

• evaporation

• condensation

• precipitation

Which of the following is NOT an example of how bacteria aid in the nitrogen cycle?

• nitrogen fixation

• breaking down the tissue of dead organisms

• changing nitrogen compounds into atmospheric nitrogen

• infecting tissue

Phytoplankton are said to release approximately how much of the oxygen in Earth’s atmosphere?

• 5%-10%

• 15%-20%

• less than 5%

• more than 50%

Which process can release carbon to the air and into the soil?

• photosynthesis

• decomposition

• combustion

• cellular respiration

Which of the following is NOT a way that carbon is stored in the environment as a fossil fuel?

• water

• coal

• oil

• natural gas