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Aim: Does light intensity affect photosynthesis? Background Information:

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Introduction

Aim: Does light intensity affect photosynthesis? Background Information: Photosynthesis means "making through light" and occurs in the cells of green plants, which are exposed to light. The word equation for photosynthesis is: Light Carbon Dioxide + Water Glucose + Oxygen Chlorophyll Although most of the glucose produced is converted into insoluble starch for storage in the stem, leaves or roots, some is used immediately by the plant to provide via respiration. There are three things which limit the rate of photosynthesis, which are temperature, carbon dioxide concentration and light intensity. This is shown as when the temperature, carbon dioxide concentration and light intensity increases, so does the rate of photosynthesis. Prediction: I think that at high light intensity the rate of photosynthesis will increase because, as shown in my background information, as light intensity increases, so does the rate of photosynthesis. ...read more.

Middle

Below is a list: * 300 ml of water * 3 pieces of pondweed * 3 spatulas of sodium hydroxide * Light will be 25cm, 20cm, 15cm, 10cm, 5cm and 0cm distance from the beaker. * After one minute the beaker will be stirred twice. * Use cold water. * I will count the number of bubbles produced after one minute. Diagram: Equipment list: * Bucket * Test tube * 500ml beaker * Funnel * 3 pieces of pondweed * 300ml of water * Lamp * Spatula * Stop watch * Sodium Hydroxide Safety points: * Always wear goggles * Clean any spilt water up so as not to fall when completing experiment. Fair test points: * Use the same amount of water * Use the same amount of pondweed * use the same temperature of water Method: 1. ...read more.

Conclusion

Distance light is from beaker Bubbles produced per minute 25 12 20 17 15 23 10 26 5 32 0 35 7. Distance light is from beaker Bubbles produced per minute 25 15 20 21 15 27 10 30 5 32 0 35 8. Distance light is from beaker Bubbles produced per minute 25 14 20 22 15 25 10 29 5 34 0 37 Repeat Results: 1. Distance light is from beaker Bubbles produced per minute 25 11 20 14 15 18 10 20 5 26 0 29 2. Distance light is from beaker Bubbles produced per minute 25 14 20 17 15 20 10 26 5 29 0 32 3. Distance light is from beaker Bubbles produced per minute 25 9 20 13 15 17 10 23 5 26 0 30 4. Distance light is from beaker Bubbles produced per minute 25 13 20 18 15 22 10 24 5 26 0 31 ...read more.

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