Question

Why is CO₂ concentration considered a factor affecting productivity?

Options

• Because it is the primary source of energy for photosynthesis

• Because it determines plant species composition

• Because it increases plant respiration rates

• Because it is an essential raw material for photosynthesis

Answer 1

CO₂ concentration affects productivity because carbon dioxide is an essential raw material for photosynthesis. In the Calvin cycle, CO₂ is fixed into organic compounds, making CO₂ availability a critical limiting factor for the rate of organic matter production by producers.