The results are in line with the hypothesis, which means the null hypothesis is rejected. We can see from the data that the rate of photosynthesis increase from 10 lux to 55 lux as electrons are becoming more excited, activating the light-dependent reactions. This would result in abundant \(NADP+H^+\). However, it would plateau at 70 lux because the next step of photosynthesis, the Calvin Cycle, requires carbon dioxide and that remained a controlled variable in the experiment. Therefore, as the light intensity increase, the rate of photosynthesis increase until it reaches a saturation point (55 lux). 

Evaluation

The Vernier light probe is highly accurate, which means the light intensity is measured accurately. Although the independent variable is accurate, the dependent variable lacks significance due to the unreliable nature of the methodology. 
The method of counting the number of bubbles means that the size of bubbles is unaccounted for. Large bubbles would carry more oxygen than smaller bubbles. Furthermore, human error is prevalent in this methodology. For example, the experimenter might miscount the number of bubbles emitted. An improved method would be calculating the change in DO concentration using a DO probe as explained below. 
As seen from the photosynthesis equation, the process of creating glucose results in oxygen as a byproduct, which could be recorded to indicate the rate of photosynthesis. An aquatic plant will release the oxygen byproduct into the water, creating bubbles. The dissolved oxygen will be calculated to measure the change in the percentage of dissolved oxygen before and after five minutes during which the plant is submerged in a tank and undergoing photosynthesis and respiration.