1108L-AF-Krieger-M

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University Of Georgia *

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1108L

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Biology

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Feb 20, 2024

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BIOL 1108L Autotrophs in a Forest Ecosystem This assignment is designed to be completed and submitted at the end of your lab. This assignment should be saved as 1108L-AF-Lastname-Firstinitial.docx. It is your responsibility to ensure that you have answered every question and submitted the correct file. Today’s lab is on terrestrial autotrophs in the forest ecosystem. Read through Background Information and Lab Activity information and answer the questions below. 1) Compare and contrast the energy flow and chemical cycling of a terrestrial ecosystem with an aquatic ecosystem. (2 pts) Both energy flows have autotrophs who collect and concentrate energy and heterotrophs who disperse that energy and eventually create inorganic compounds which will be used by autotrophs. However aquatic systems heavily depend on water to carry out many processes including dispersing offspring and food sources. 2) What challenges meeting their life needs would organisms face moving from an aquatic environment to a terrestrial one? (2 pts) Not having enough water and specific nutrients could significantly hurt the organism. The organism may also not be able to find its food source in a terrestrial environment. 3) Examine the moss specimen and slide at your bench. What structures do you notice? What other observations can you make? (2 pts) There are rhizoids to act as roots, no stomata, and the leaves are thin. The leaves are small, and you can see the moisture on them. 4) Describe and explain the results from adding eosin dye to the rooted and unrooted Coleus cuttings. (1 pt) The rooted plant has little to no color change while the unrooted plant changed to a darker color. This shows that the rooted plant’s roots helped filter out the dye more compared to the unrooted plant. 5) After observing the prepared leaf slides, compare the number and arrangement of stomata between the two different plants. How might any differences affect transpiration? (2 pts) Monocot: There are many stomata, and they are in a grid-like pattern. Dipcot: There are less stomata and they are mismatched. The stomata are larger and arranged in a puzzle piece way.
BIOL 1108L Autotrophs in a Forest Ecosystem This shows that the monocot plant probably has more transpiration due to the increased about of stomata. 6) a) Fill out the table below with your observations of the cobalt chloride strips. (1 pt) Sunflower Leaf Top Sunflower Leaf Bottom Coleus Leaf Top Coleus Leaf Bottom Magnolia Leaf Top Magnolia Leaf Bottom Cobalt Chloride Observations purple pink Blue blue blue blue b) Provide an explanation for any differences observed between each of the plants and between the top and bottom of each plant. (1 pt) There is more stomata in the bottom of the plant, so the moisture collects there than at the top of the plant. The sun also evaporates stomata and water on top of the plant, so it is harder for the top of the leaf to retain moisture. 7) Explain how the structures of the terrestrial autotrophs you have observed enable them to overcome the challenges of terrestrial life. (2 pts) Plants can overcome challenges by using roots to filter out unneeded nutrients and using their stomata to transpire more water. Plants have adapted to terrestrial life with the number of stomata they have so they get the correct amount of water needed. Plants have also adapted by keeping most of the stomata at the underside of their leaves so that they have a water supply even when there is little rain. 8) Review the Scientific Article: Fote and Mutiti, 2017, then focus on the Results section. Refer to Fig. 3 and, using your own words, describe your interpretation of the data displayed. (1 pt) Fig 3 showed that the plants took up the metals into their system and surrounding soil also had elevated levels of nano-CuOx 10000ppm. 9) Refer to Fig. 11, describe your interpretation of the data displayed. (1 pt) Fig 11 shows that most of the Cu remains in the soil, but H. paniculata absorbs more of the Cu than the H. annus.
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