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In an experiment the rate of photosynthesis first increases and then becomes constant as light intensity rises. What should be placed on the horizontal axis of the graph?

Answer and explanation

Correct answer: Light intensity

A graph usually places the independent variable on the horizontal axis and the dependent variable on the vertical axis. The independent variable is the factor that is changed or selected by the investigator. The graph then shows how the measured response changes as that factor increases or decreases. This convention also makes the direction of the relationship easy to understand.

In this experiment, light intensity is increased, while the rate of photosynthesis is measured. Thus light intensity is the independent variable and belongs on the horizontal axis. The rate of photosynthesis belongs on the vertical axis, because it is the response. The graph may rise at first and then become level, showing that the rate reaches a limiting value. Therefore, option B is correct.

Related tags

GraphIndependent VariablePhotosynthesisVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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