Explanation 1-4:
In this experiment, the independent variable is the light intensity, which is being deliberately changed by the experimenter through the manipulation of the lamp's distance from the aquatic plant. The dependent variable is the rate of photosynthesis, which is being measured by the amount of gas produced by the plant in one minute. The control variable is the amount of gas produced, which is being held constant by measuring the gas production over a fixed time interval (one minute). Other factors that could affect the rate of photosynthesis, such as temperature, water quality, and the type of plant being used, should also be kept constant in order to isolate the effect of the independent variable on the dependent variable.
Explanation 5:
It is not possible for me to conclude anything about this experiment without additional information. The information provided in the question does not include any data or results from the experiment, so there is nothing that can be concluded at this time. In order to draw conclusions from an experiment, it is necessary to collect and analyze data, test hypotheses, and evaluate the results in the context of the research question or problem being investigated. Conclusions should be based on the evidence gathered during the experiment and should be carefully supported by the data and the experimenter's observations.