Question 13
Investigate how light intensity, varied by the distance of a freshwater plant from a light source, affects the rate of photosynthesis. Materials: freshwater plant (such as elodea, cabomba or hydrilla), beaker, test tube, water, ruler, light source such as a lamp, timer or stopwatch. Work in groups. Plan and carry out a fair test using the given materials. Write the steps you will follow to carry out your investigation. Use a separate sheet of paper.
• How will you set up the equipment? Decide on your actions.
• What observations will you make? How many measurements do you need? The results table provides five rows, with three repeat readings and a mean at each distance.
• What will you do to stay safe during the practical?
Ask your teacher to check your plan. Then carry it out.
• How will you set up the equipment? Decide on your actions.
• What observations will you make? How many measurements do you need? The results table provides five rows, with three repeat readings and a mean at each distance.
• What will you do to stay safe during the practical?
Ask your teacher to check your plan. Then carry it out.
