Final answer:
The value of photosynthetically active radiation above which no further increase in photosynthesis occurs is referred to as the light saturation point. This is the point at which the plant has received enough light energy and any additional increase in light intensity will not lead to an increase in photosynthesis. At this point, the plant has reached its maximum photosynthetic capacity. Hence the correct answer is option D
Step-by-step explanation:
The value of photosynthetically active radiation above which no further increase in photosynthesis occurs is referred to as the light saturation point. This is the point at which the plant has received enough light energy and any additional increase in light intensity will not lead to an increase in photosynthesis. At this point, the plant has reached its maximum photosynthetic capacity.
Hence the correct answer is option D