Photosythesis Experiments

But how can we measure the rates at which photosynthesis takes place? There are a few key methods to calculate the rate of photosynthesis.

These include: 1) Measuring the uptake of CO 3) Measuring the production of carbohydrates 4) Measuring the increase in dry mass As the equation for respiration is almost the reverse of the one for photosynthesis, you will need to think whether these methods measure photosynthesis alone or whether they are measuring the balance between photosynthesis and respiration.

This could give a comparison between several plants.

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Hence animals, fungi and non-photosynthetic bacteria depend on these for the maintenance of life. a field 100 m by 100 m) of wheat can convert as much as 10,000 kg of carbon from carbon dioxide into the carbon of sugar in a year, giving a total yield of 25,000 kg of sugar per year. So 15% of the total carbon dioxide in the atmosphere moves into photosynthetic organisms each year.The vast majority of plant species, including most trees, and major crops such as rice and wheat, use C3.C4 plants, in contrast, comprise just 3% of species.As with most methods, you need several plants so you have replicate measurements and you can find an average and a standard deviation if necessary.Photosynthesis is the process in which green plants (primarily) convert energy from the sun’s light into usable, chemical energy.The leaf area of the plants should be measured so you can compensate for plant size. Oxygen can be measured by counting bubbles evolved from pondweed, or by using the Audus apparatus to measure the amount of gas evolved over a period of time.To do this, place Cabomba pondweed in an upside down syringe in a water bath connected to a capillary tube (you can also use Elodea, but we find Cabomba more reliable). You can then investigate the amount of gas produced at different distances from a lamp.The leaf that was in the light turns blue-black, which demonstrates that the leaf has been performing photosynthesis and producing starch.Try the test again with a variegated leaf (one with both green and white) that has been in the sunlight.Read a full protocol on how to investigate photosynthesis using pondweed.There is a crude method where a disc is cut out of one side of a leaf (using a cork borer against a rubber bung) and weighed after drying.

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