(Grade A) Investigating Photosynthesis.doc

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Investigating Photosynthesis

Aim

The aim of this investigation is to find out how the amount of light (light intensity) affects the rate of photosynthesis.

Dependent Variable

Light intensity, distance, lamp and plant

Control Variable

Temperature, amount of pondweed, amount of sodium hydrogen carbonate, presence of Chlorophyll (catalyst), time

Apparatus 

  1. lamp
  2. ruler
  3. beaker
  4. funnel
  5. boiling tube
  6. sodium hydrogen carbonate
  7. pondweed  
  8. water
  9. thermometer
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Method

1) add 200 cm of “pond” water and one spatula full of sodium hydrogen carbonate into a beaker

2) cut a sprig of pondweed 5 cm long

3) place a funnel, a boiling tube half-filled with water and the pondweed into the beaker of water as shown in the diagram

4) place the thermometer in the water of beaker and record the temperature

5) wait for the plant to begin to produce a steady stream of bubbles

6) shield the set-up from unwanted light, e.g room lighting, sunlight, etc.

7) ...

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