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How will more carbon dioxide affect the rate of photosynthesis?

Would Radioactive Carbon Dioxide affect photosynthesis?

  • Supposedly, John wants to conduct an experiment to study the movement of materials in a plant. He removed the phloem from one part of the stem and left the xylem intact. The whole set-up was placed under bright sun-light. Leaf 1 is (Below the cut-off part) and Leaf 2 is (Above the cut-off point). Cut off point is where the phloem tube is removed. However, leaf 2 is sealed in a case with radioactive carbon dioxide. So, what is the purpose of him conducting this experiment and whether radioactive carbon dioxide would affect photosynthesis?

  • Answer:

    Radioactive Carbon Dioxide is used simply as a label so that the destination and fate of the CO2 fixed in photosynthesis in leaf 2 can be determined to see if it is transported below the region where the phloem is removed. Since photosynthetic products are translocated in the phloem No radioactivity should be seen below the point of the cut.

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Radioactivity does not change the chemical reactivity. It is used to check to see where the O2 product comes from . It could be the H2O or the CO2. You did not mention whether the radioactive part was the O or the C. If it was the C, the aforementioned experiment would not work.

science teacher

It will stunt the growth of plants but will not kill them.

Harold

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