Which term describes the organisms that convert inorganic carbon into organic matter using light energy?

• A. Osmosis
• B. Primary Producer
• C. Oceanic Zone
• D. Primary Productivity

Answer: (B)

Organisms that convert inorganic carbon into organic matter using light energy are primary producers. They harness light to power photosynthesis, fixing carbon dioxide into organic molecules and forming the base of the food web. In the ocean, phytoplankton are the main primary producers, turning CO2 and water into sugars and releasing oxygen in the process. Primary productivity describes how fast this production happens, not the organisms themselves, while osmosis is a water-transport process and an oceanic zone is a region, so they don’t fit the description of the organisms.