Core Practical - B8 Photosynthesis 0.0 / 5 ? BiologyPhotosynthesis and transpirationPhotosynthesis PracticalGCSEAQA Created by: maddieecarrCreated on: 01-12-19 11:48 Materials needed a beaker a filter funnel plasticine a measuring cylinder (1 or 10 cm3 ) a 10 cm piece of pondweed a light source a metre rule a stopwatch. 1 of 2 Method Put your 10 cm piece of pond weed (cut edge at the top) into a beaker of water. Cover the pondweed with an inverted filter funnel – raised off the bottom of the beaker with plasticine. Fill the measuring cylinder with water and gently position. Use the ruler to position the beaker of pondweed 1 metre away from the light source. Start the stopwatch and: a. count and record the number of bubbles released in three minutes b. record the volume of gas produced and collected in the measuring cylinder in the same three minutes. Record your results in a table. Move the light source so that the pondweed beaker is 80 cm away. Refill the measuring cylinder with water and gently position as in the diagram. Repeat the experiment Repeat for distances of 60, 40 and 20 cm 2 of 2
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