Our aim today was to measure the effect of ligh intensity on photosynthesis. We set up a light system and put waterweed plants in a test tube upside down with water and sodium carbonate. Then we measured the distance from the test tube to the light and how many bubbles came from the plant in a minute. Then we changed the distance and repeated this. This shows effects on photosynthesis by light because plants produce oxygen when they perform photosynthesis, these are the bubbles.