i have attached the lab and it question. csn you please help me. 6.2C A Multicel

Question

i have attached the lab and it question. csn you please help me.

6.2C A Multicellular Eukaryote: Elodea In this procedure, you will observe the photosynthetic plant cells of an aquatic flowering plant, Elodea. Elodea spp. are found in freshwater ponds and bodies of slow-moving freshwater and are also common in freshwater fish tanks and larger fish ponds. Elodea is also known as Anacharis spp. and by the commor names pondweed and water weed. 1. Obtain several clean glass slides, several cover slips, a pair of forceps, and a transfer pipette. 2. Make a wet mount of a leaf of Elodea Reread the Preparation of a Wet Mount procedure in the previous exercise if you need a review. 3. Rotate the scanning objective into position over the stage window. 4. Using the proper technique, place the slide on the stage of the microscope and focus the scanning objective on the leaf 5. Focus the specimen under the low and high- dry objectives. Remember to use the correct technique. 6. To improve the image, there may be a need to adjust the amount of light passing through the specimen. Adjust the light by sliding the e 6: Cells

Explanation / Answer

Aswer 1: THe Elodea leaf under a low resolution scanning microscope appears more green. However under a high dry objective, the cells appear transparent with only the chloroplasts appearing green. This observation is due to scattering of light.  

Answer 2: The Elodea leaf is two layer thick

Answer 3: There are approximately 20-22 chloroplasts in a fully grown Elodea leaf cell. The numerous chloroplasts allow the cell to make its own food ( by photosynthesis)

Answer 4: Chloroplasts movement in aldoea leaves alters with heat and light and is changed by increases and decreases in fluid content. It appears to be a response to light intensity. In extreme light exposure, the chloroplasts line up like the blades of a Venetian blind to let the light pass through. On dim, dark days, they flip their alignment, like the Venetian blind closing, to catch what light is present. This appears to be a method of adjusting the amount of damage to the plant by sunlight.

The chloroplast movement happens by the following phenomenon. This movement is on intracellular tracks called microfilaments, composed of actin proteins. The organelles are attached to the actin filaments by myosin, which is a member of a group of proteins called motor proteins. These proteins are able to transform the chemical energy in ATP into mechanical energy. Thus, myosin uses the energy released during the breakdown of ATP to change its conformation and “walk” down the actin filament. Mitochondria also move in the cytoplasm but they are not visible under the microscope.

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