Question: what is the effect of light intensity on biomass?
Answer: The longer duration of light brought about increased biomass of C. vulgaris (Fig. 2). However, light intensity showed different effects on biomass; increase in light intensity from 37.5 to 62.5 μmol photons m−2 s−1 resulted in increased biomass, but at 100 μmol photons m−2 s−1, biomass decreased.