A scientist investigated the photosynthetic rate of a marine cyanobacterium under controlled conditions and noted the following observations:
Which of the following statements, A to D, correctly explains these observations?
The pigments absorb red and orange light, and at light intensities above 200 μmol m−2 s−1200\ \mu\text{mol}\ \text{m}^{-2}\ \text{s}^{-1}200 μmol m−2 s−1, temperature is a limiting factor.
The pigments absorb blue and green light, and at light intensities above 200 μmol m−2 s−1200\ \mu\text{mol}\ \text{m}^{-2}\ \text{s}^{-1}200 μmol m−2 s−1, temperature is a limiting factor.
The pigments absorb red and orange light, and at light intensities below 200 μmol m−2 s−1200\ \mu\text{mol}\ \text{m}^{-2}\ \text{s}^{-1}200 μmol m−2 s−1, temperature is a limiting factor.
The pigments absorb blue and green light, and at light intensities below 200 μmol m−2 s−1200\ \mu\text{mol}\ \text{m}^{-2}\ \text{s}^{-1}200 μmol m−2 s−1, light intensity is not a limiting factor.
