pondweed practical

• What is the first step in the practical procedure for pondweed?

  Place the pondweed in a beaker containing 20mm of water
• What should be added to the water after placing the pondweed in the beaker?

  Add one spatula of sodium hydrogen carbonate to the water
• How many pieces of plasticine should be stuck to the rim of the funnel?

  Three small pieces of plasticine
• Why is the funnel placed upside down over the plant?

  To collect the oxygen bubbles produced by the pondweed
• What should be done with the test tube before placing it in the experiment?

  Completely fill a test tube with water
• How should the funnel be positioned in relation to the water clamp?

  Carefully place one end of the funnel with the end of the water clamp in place
• How far should the lamp be placed from the pondweed?

  5cm away from the pondweed
• What should be started to measure the oxygen production?

  Start the stopwatch and record the number of bubbles of oxygen produced in one minute
• What should be done after recording the number of bubbles at 5cm?

  Repeat the procedure at 10cm, 15cm, 20cm, 25cm, and 30cm