Chemical Cycles and Processes in Biology

The video explores how chemicals cycle through ecosystems, focusing on carbon, nitrogen, and phosphorus cycles. It explains the role of producers, consumers, and decomposers in converting inorganic chemicals into organic forms and back. The video highlights the importance of chemical cycles in maintaining ecosystem balance and the conservation of matter.

Which of the following elements is NOT commonly found in living organisms?

• Helium

• Nitrogen

• Carbon

• Hydrogen

What process do plants use to convert carbon dioxide into glucose?

• Respiration

• Photosynthesis

• Decomposition

• Combustion

How is carbon returned to the atmosphere from living organisms?

• Photosynthesis

• Combustion

• Cellular respiration

• Nitrogen fixation

What is the initial form of nitrogen in the atmosphere?

• Nitrogen gas

• Ammonium

• Nitrate

• Nitrite

Which organisms are primarily responsible for converting atmospheric nitrogen into a usable form?

• Fungi

• Plants

• Bacteria

• Animals

In the phosphorus cycle, where does phosphorus initially come from?

• Soil

• Water

• Rocks

• Atmosphere

What process breaks down rocks to release phosphates into the soil?

• Combustion

• Respiration

• Weathering

• Photosynthesis

What is the term for the process where plants convert inorganic chemicals into organic forms?

• Combustion

• Assimilation

• Respiration

• Decomposition

Which of the following is NOT a part of the chemical cycles discussed?

• Phosphorus cycle

• Nitrogen cycle

• Carbon cycle

• Oxygen cycle

What role do decomposers play in chemical cycles?

• They perform photosynthesis

• They break down dead organisms

• They fix nitrogen

• They produce glucose