Biology Figures

CO₂ and O₂ concentration around a plant in the light and then the dark

An example figure from the Photosynthesis Rate generator.

Graph against time in minutes, 0 to 60, on a grid, with CO₂ concentration (%) on the left axis and O₂ concentration (%) on the right: in the first 30 minutes, unshaded and labeled Light, the solid blue CO₂ line falls from 0.04 % toward 0.01 % while the dashed red O₂ line rises from 21 % to about 21.03 %; in the shaded half labeled Dark, CO₂ rises and O₂ falls in straight lines
The CO₂ (solid blue, left axis) and O₂ (dashed red, right axis) in a closed chamber around a plant in bright light for 30 minutes, then in the dark, shaded. In the light, photosynthesis takes in CO₂ and gives off O₂ faster than respiration does the opposite, so the CO₂ falls and the O₂ rises by the same amount, both levelling off. In the dark the plant only respires: the CO₂ rises and the O₂ falls in straight lines.
Edit this figure Download PNG

Editing opens it in Photosynthesis Rate with these settings, to change anything and copy or download your own.

Answer key

  • In the light, CO₂ falls from 0.04 % to 0.01 %, and O₂ rises by the same, to 21.03 %
  • In the dark, from 30 minutes, CO₂ rises and O₂ falls in straight lines: respiration only

Free to use in your tests, worksheets, slides or anything else, no credit needed. Public domain under CC0 1.0. How to reuse our figures

More Photosynthesis Rate examples

Make your own in Photosynthesis Rate →