What term refers to the total amount of biomass produced per unit area per unit time by photosynthesis?

• A. Physical Factor
• B. Nutrient
• C. Primary Productivity
• D. Scientific Name

Answer: (C)

Primary productivity is the rate at which autotrophs convert inorganic carbon into new organic biomass per unit area per unit time through photosynthesis. This measures the total amount of biomass produced across a patch of ecosystem in a given time and is often expressed as grams of carbon fixed per square meter per day or year. In marine systems, it reflects how much energy is available to fuel the rest of the food web. The other terms don’t describe production rate: a physical factor refers to environmental conditions, a nutrient is a substance that can limit growth, and a scientific name is the taxonomic label for organisms.