BIO 101 Photsyn-Lab-Handout

If leaf disks are exposed to light, they will be able to photosynthesize, while the leaf disks that are not exposed to light (kept in the dark) will not be able to photosynthesize. Data Table 2: Leaf Disk Assay, Light Treatment Time (minute s) A (0.24% ) B (0.24% ) Average of A and B A (0.12% ) B (0.12% ) Average of A and B 0 0 0 0 0 0 0 5 0 0 0 0 0 0 10 3 3 3 0 0 0 15 4 5 4.5 2 1 1.5 20 8 8 8 3 1 2 25 8 10 9 4 3 3.5 30 10 10 10 4 4 4 35 10 10 10 4 4 4 40 10 10 10 4 6 5 45 10 10 10 7 7 7 50 10 10 10 8 8 8 55 10 10 10 10 10 7 60 10 10 10 10 10 7.5 Data Table 3: Leaf Disk Assay, Dark Treatment Time (minute s) A (0.24% ) B (0.24% ) Average of A and B A (0.12% ) B (0.12% ) Average of A and B 0 0 0 0 0 0 0 5 0 0 0 0 0 0

the dark treatment, the disks do not float for the entirety of the experiment. 9. How did the baking soda solution affect photosynthetic rates? The higher the concentration of baking soda, the more the rate of photosynthesis increases. Photosynthesis requires water, and carbon dioxide to produce glucose and oxygen as their by- product- H 2 O + CO 2 <=> C 6 H 12 O 6 + 6 O 2 Thus, the more reactants on the left side, the more products on the right side. Sodium bicarbonate (baking soda) when mixed in water produces the by-product bicarbonate and sodium ions. Bicarbonate (HCO 3 ) would then be the new source of carbon in photosynthesis; thus it increases the number of reactants on the left. Graph