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At low light there isn't enough light for all the chloroplasts to be involved. As the light increases more chloroplasts are working so more bubbles are produced. At some point all the chloroplasts are working so adding more light won't make a difference because there aren't any more extra chloroplasts to work.

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As the distance from the lamp increases the bubbles/min decreases

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As plants grow they use sunlight and temperature. As with all other enzyme controlled reactions it is affected by temperature. The rate of reaction decreases in the winter because the temperatures are lower and there are less sunlight hours as well.

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1. Put the plant in the dark for 24hrs - To destarch it
2. Block the light or block CO2 - To let PS occur if it can
3. Put leaf in boiling water (5 mins) - To kill cells
4. Put leaf in boiling ethanol (5 mins) - To decolourise it (breaks open chloroplasts)
5. Put leaf back in boiling water - to soften the leaf
6. Put the leaf on a tile and add iodine - to indicate if starch is present

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These factors can be controlled within a greenhouse.
- Lamps can provide light
- Carbon dioxide can be controlled
- Temperature can be increased using heater

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no. of bubbles = rate of photosynthesis

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If we were testing light intensity we have to keep CO2 concentration temperature the same.

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How fast a plant can grow depends on how fast it can photosynthesize.

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It occurs when there is enough light (and other environmental factors are correct)

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It occurs in green plants (and any photosynthetic organisms) - in the chloroplasts, mainly in leaves (but really in any green region of a plant)

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Carbon Dioxide + Water --> Glucose + Oxygen

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Carbon Dioxide + Water --> Glucose + Oxygen

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Photosynthesis is a chemical reaction that uses chlorophyll to absorb energy from the sun to convert carbon dioxide and water into glucose producing oxygen as a by product.