the effect of light intensity on the rate of photosynthesis.

• Method A lamp with an LED bulb is set up at different distances from the plant in a beaker of water
• As distance away from bulb increase what happens go light intensity 


  Decrease
• What is independent variable ?


  distance from the light source/light intensity
• What is dependent variable?


  the number of bubbles produced per minute
• What is control variable 


  concentration of sodium hydrogen carbonate solution, temperature, using the same piece of pondweed each time
• Risk


  Dry your hand before touching lamp