The figure shows the effect of light on the rate of photosynthesis. Based on the graph,answer the following questions:
$(a)$ In which region/s (indicated by arrows) is light a limiting factor?
$(b)$ What could be the limiting factor/s in the region where the rate of photosynthesis becomes constant?
$(c)$ What does the point where the curve flattens represent?

(N/A) Light is a limiting factor in the region where the rate of photosynthesis increases linearly with an increase in light intensity. In the given graph,this corresponds to the initial rising region indicated by the first arrow.
$(b)$ In the region where the rate of photosynthesis becomes constant (plateau region),light is no longer a limiting factor. Other factors such as temperature,carbon dioxide concentration,or water availability become the limiting factors.
$(c)$ The point where the curve flattens represents the light saturation point. At this intensity,the rate of photosynthesis reaches its maximum,and further increases in light intensity do not increase the rate of photosynthesis.