In this lab, your lab group will be observing the effects of solutes on osmosis

Question

In this lab, your lab group will be observing the effects of solutes on osmosis using either ne aquatic plant, Hydrilla, or the skin of a red onion. If using Hydrilla, plants in class come from he an Marcos River where they were introduced for the aquarium trade -but the idea failed and eplants prospered. Currently, there is a concerted effort to remove Hydrilla from the waterways of San Marcos. The leaves of Hvdrilla have cells that are large and contain numerous large chloroplasts. In healthy cells, cvtoplasmic streaming is apparent around the central vacuole just be neath the cell membrane, occurring close to the cell wall or on the periphery of the cell. The central vacuole in these plant cells is colorless but its increase and decrease in size can be served by noting the position of the chloroplasts. Red onion epidermal cells contain a central Vacuole filled with red pigment. The central vacuole stores water and takes up the vast majority of cell volume (-90%) making the process of osmosis easy to Protocol I. Red onion epidermis or Hydrilla tored in fresh tap water and in plenty of light will be supplied

Explanation / Answer

Leaves or pieces of red onion skin will swell up in distilled water, i.e it will undergo hypotonic conditions and will get shrink in 5% NaCl due to hypertonic conditions.

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