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The portions that appeared white or less colorful did not contain any starch, according to the starch test. Additionally, it demonstrated that the sections that appeared purple contained starch. This indicates that the chloroplasts found in the purple and green sections allowed them to undergo photosynthesis.

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After doing the starch test on the Coleus leaf, the parts of the leaf that are purple turned black meaning starch is there while the green part did not get stained meaning no starch. Only the green parts with chlorophyll can do photosynthesis so not all parts of a leaf are photosynthetic. The purple part of the leaf is not photosynthetic but the green is.

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A starch test was performed on a Coleus (Plectranthus scutellarioides) plant (a C3 photosynthesis plant) using an iodine solution. The leaf was boiled in water in order to soften the leaf, then boiled in ethanol to remove the chlorophyll pigments. Following the removal of the pigments, the iodine solution was placed on the leaf and a starch test was performed. The results are as follows: the parts of the leaf that had been purple stained black (i.e., a positive starch test), whereas the parts of the leaf that had been green did not stain black (i.e., a negative starch test). These results suggest that the starch was stored in the parts of the leaf that had been purple but was not stored in the parts of the leaf that are green.

Not all parts of a leaf are photosynthetic; only those parts of the leaf that contain chlorophyll are able to undergo photosynthesis. Thus, the green parts of the leaf are capable of photosynthesis (i.e., those which contain chlorophyll pigments) while the purple parts of the leaf are unable to perform photosynthesis if they do not have any chlorophyll present. Ultimately, only the parts of a leaf that have chlorophyll are able to perform photosynthesis.

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We used Iodine to test for the presence of starch. Starch should turn dark when exposed to iodine. Dark coloration is present along the leaf away from the stem, where it was green and purple before bleaching. The stem of the plant, which was white before bleaching, did not turn dark. Starch content correlates with photosynthesis, so we can infer that the green areas photosynthesize and the white areas do not.

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After boiling the leaf in water and ethanol, a starch test was conducted. Iodine was used on the leaf, and it was found that there was no starch in the stem of the leaf, however, there was starch found in the darker parts of the leaf. These parts do not perform photosynthesis due to the lack of chlorophyll. These parts are also used for storage, whereas, the green parts of the leaf are used to conducted photosynthesis.

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A positive starch test will result from the process of photosynthesis. As seen the at the conclusion of the starch test. photosynthesis took place in the areas that turned dark/purple. We can see in this example that there's a positive reading of starch present in the outer parts of the leaf away from the stem.

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The starch test revealed that there was no starch contained in the areas that appeared white or less colorful. It also revealed that there was starch in the areas that appeared purple. This means that the purple parts as well as the green parts were able to perform photosynthesis due to the chloroplasts they contain.

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After ethanol bleaching, a starch test was able to show evidence of starch in parts of the Coelus leaf with more pigmentation. These areas would not have been photosynthetic either due to the lack of chlorophyll pigmentation. Previously green parts of the leaf, however, which would be areas undergoing photosynthesis, showed no evidence of starch after bleaching and testing. This shows the separation of utility in different parts of the leaf, where one part would be used for photosynthesis while the rest could be used for storage.

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We used iodine to test for starch of which we revealed there was no photosynthesis s activity in the stem but a lot of activity in the leaf. A color change in the plant from green to purple indicated starch which indicated photosynthesis activity.

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The iodine used for the starch test did not reveal any starch on the stem of the leaf, which means that there wasn't any photosynthesis happening on the lighter parts of the leaf. In contrast, the green section of the leaf did react to the iodine, which means that the darker portions of the leaf in the after photo were able to perform photosynthesis. This is likely due to the green sections of the leaves having chlorophyll, which indicts where photosynthesis is taking place.

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The starch test results show that in the parts where the leaf itself turned dark purple means photosynthesis is preformed in that area. The areas where it is still green shows no starch production meaning photosynthesis is not happening. The stem and veins through the leaf are not dark purple showing no starch.

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Iodine was used to stain a Coleus leaf after it had been boiled in water to remove purple pigment and in ethanol to remove chlorophyll. The dark blue color on this leaf indicates a presence of starch. A presence of starch indicates that this area of the leaf is capable of carrying out photosynthesis. The results of this test show that there is starch in the areas of the leaf that were originally purple and green. However, the area of the leaf that was white did not dye. Based on the results of this starch test, we can conclude that photosynthesis takes place where the leaf is green and purple, but not where the leaf is white.

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The iodine test showed that there was starch present in the areas of the leaf that had been purple. There was some starch present in the green areas of the leaf, but not as much as the purple areas. This is shown by the purple areas being a darker black after the iodine staining. These results show that not all parts of a leaf are photosynthetic in the same capacity. In this case, the purple parts of the leaf could undergo photosynthesis and produce starch more than the green parts. The white part in the middle of the leaf did not produce any starch, showing it cannot undergo photosynthesis. This makes sense because the white area would not contain any chloroplasts

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The areas of purple/pink color contained starch and the stem/inner part of the leaf did not contain starch because they remained green. The pink/purple areas lack chlorophyll (the green pigment) and therefore performed photosynthesis. However, the stem and insider area did not turn color and stayed green therefore there was no starch content and could not perform photosynthesis.

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The iodine starch test results showed that the black/purple coloration on the leaves did not contain any starch and the green parts of the leave did include starch. The leaves would have turned a black color if there was any starch content. The result of the test showed that the stem and the black/purple part of the leaf did not contain any starch. The colored parts of the leaf did not contain the pigment chlorophyll a. This means that there is no chloroplasts for photosynthesis to occur.

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The starch test results showed that variegated parts (black, purple, and pink coloration) of the leaf did not have any starch. The results of the green parts of the leaf included starch. We know this because iodine turns the starch black.

Not all parts of the leaf were photosynthetic. The stem and the variegated part of the leaf did not have any starch content. The variegated parts lack chlorophyll a (green pigment). This means there is no chloroplast to photosynthesize. The stem did not have a positive iodine test therefore it cannot photosynthesize.

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The iodine did not reveal any starch on the stem of the leaf, where it was only white. This means photosynthesis is not occurring on the white portions of the leaf. However, the purple and green parts of the plant did contain starch and therefore are able to perform photosynthesis. This makes sense because chloroplasts have a green pigment, and this is where photosynthesis takes place. The purple portions are not green, but still may contain chloroplasts, along with other pigments or chromoplasts that give it a different color.

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After boiling the leaf and saturating it with iodine, we can see the parts of the leaf that holds starch. Comparing to the before photo, it appears that the majority of starch is held in the parts of the leaf that were previously purple. The parts that were green did not change with the iodine. The parts of the leaf that are purple are still able to carry out photosynthesis. They still have chlorophyll, although in lesser quantity than the green portion, and have accessory pigments which absorb other wavelengths of light and then passes the energy onto chlorophyll a.

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Upload photos of your leaf—before and after the starch test—to the “Leaf Starch Test” Padlet. Include answers to the questions above in complete sentences that can be understood without reference to the questions.