Pdf influence of salinity on the growth of elodea species. Pinpoint the stage of photosynthesis in which carbon is fixed. Alaska plant materials center division of agriculture. There is also a native species of elodea found in indiana, american elodea e. Data collection will be accomplished with the vernier optical do sensor. All organisms are dependent on a healthy carbon dioxideoxygen. To observe the rate of photosynthesis under different light conditions. One may confuse brazilian elodea with another exotic weed, hydrilla hydrilla verticillata.
Cellular respiration virtual lab carbon transfer through snails and elodea background. Start with the low power objective and work your way until you have focused the leaf using the high power objective. Read pdf elodea cheek cell lab answers plasmolysis in elodea plant cells science netlinks purpose the purpose of this lab is to learn how to prepare a wet mound, to learn proper staining techniques and to examine human cheek cells and onion skin cells. We will be comparing the rate of photosynthesis in different light intensities including in the dark by viewing the number of leaf disks that rise to the surface of a special solution over time. The ultimate source of energy for almost all of life on earth is the light that comes from the sun see the box on the next page for an. Water passes through cell membranes from areas of high water concentration to areas of lower water concentration. Qualitative and quantitative plasmolysis lab do not write on. Flask with bromothymol blue flask after blowing gently flask with elodea initially flask with elodea after 24 hours flask a flask b flask c flask d analysis. Elodea lab this lab is designed to show how photosynthesis takes place in the aquatic plant elodea. Elodea, they are asked to design an experiment which will allow them to demonstrate the use of.
Using aquatic plants to demonstrate photosynthesis. The procedure for this would be to leave the elodea plant in water with sodium bicarbonate baking soda increases carbon dioxide in water, set up the lamp at 5cm distance and start the timer for 3 minutes. Elodea high school inquiryscientific method plants. However, in bulgaria, area we want to focus on, kaspersky lab official distributors do not provide variety of choices in kaspersky lab software in local language. As the slide warms from the light of the microscope, you may see the chloroplasts moving, a process called cytoplasmic streaming. Elodea can be kept living in an aquarium long term if anchored with gravel it should then begin to grow. Hydrilla will have rough teeth on the underside of the leaves where brazilian elodea will not. The growth rate of plants and their effect on the nitro. Make sure it is pushed down to the bottom of the test tube. Plant cell lab onion and elodea the biology corner. Dense growth of elodea can interfere with some uses of the pond, such as boating and fishing. Outline the equations for photosynthesis and respiration. However, elodea continued to expand its distribution into greater depths even. Photosynthesis is the process by which plants take carbon dioxide from the atmosphere, add water, and use the energy of sunlight.
This lab has been created in order to find what extent does distance from a light source 5cm, 10cm, and 15cm affect the rate of photosynthesis measured in bubbles 3 min in elodea water plants. Excessive growth can also reduce dissolved oxygen levels during the summer causing fish kills. This lab involves the qualitative measurement of the changes in carbon dioxide concentration associated with respiration and photosynthesis in the freshwater plant elodea. Select the elodea cell at the top of the screen and drag it into the hypotonic beaker. Elodea is an underwater perennial plant that sometimes forms tangled masses in lakes, ponds, and ditches with long, trailing stems and green, somewhat translucent leaves. Elodea is a common plant that lives in freshwater habitats such as ponds and lakes. Using forceps, remove a small leaf from the tip of an elodea plant and lay it flat in the drop of water. Elodea, genus of five or six species of submerged aquatic plants in the frogsbit family hydrocharitaceae, useful in aquariums and in laboratory demonstrations of cellular activities. Using forceps, remove a small leaf from the tip of an elodea plant and lay. Your lab group is asked to design, execute, and analyze an experiment that tries to accomplish the following two tasks.
Osmosis is the process whereby water moves across a cell membrane by diffusion. Photosynthesis in elodea lab essay example graduateway. Elodea prefers cool, clear, slow waters with silty. File type pdf elodea onion cheek cell lab answers elodea onion cheek cell lab answers thank you enormously much for downloading elodea onion cheek cell lab answers. Prepare a wet mount of an elodea leaf with tap water. Using elodea in the lab science and plants for schools. Describe the shape and the location of chloroplasts. In this lab activity you will observe the effects of osmosis on plant cells. Demonstrate that environmental co2 is used during photosynthesis in elodea. Blades biological provide care information for both the pondweeds elodea and cabomba. Qualitative and quantitative plasmolysis lab do not write on this lab return it at the end of the class period. In all three cells, water moved into the cells white they were surrounded by hypotonic solution.
Did water move into the cell or out of the cell while it was surrounded by hypotonic solution. There are localized versions of kaspersky products for russia, the united states of america, france, spain, poland, turkey, japan, india, and etc. It it is found in both still and flowing waters, in lakes, ponds, pools, ditches, and quiet streams. Elodea is considered an invasive species in some areas and care must be exercised when disposing of left over plants.
Elodea canadensisusually bright green with three leaves that form whorls around the stem. The lab handout should be given to students at least a day before their first involvement. Other containers can be substituted an area in the lab lit for 24 hours preferably with plant growbulbs, otherwise use a welllighted window and an area shielded from all light like a closed cabinet. Carbon dioxide dissolves in and reacts with water, forming carbonic acid, h 2co 3. Live elodea anacharis aquatic plant for biology and life science is healthy, viable and ready for transplant into your freshwater aquarium or for laboratory study. If your state limits the availability of some aquatic organisms such as elodea, carolina has alternatives or replacements that we guarantee will work just as well for your les. This lab focuses on several different factors that affect the net rate of photosynthesis. To do this, place a drop of water towards one end of the slide. Elodea strands reached the lake surface through at least 198587, but then began to dieback. What differences did you observe in the water between the elodea in the light and. This lab is designed to show how photosynthesis takes place in the aquatic plant elodea.
Cut out the letter e and place it on the slide face up. To do this let h20 sit overnight in a container with a large surface area. Photosynthesis and cellular respiration are key processes in maintaining this balance. The leaves of elodea are only a few cells thick and allow light to pass through the leaf without special preparation techniques. Broken plant fragments can root to form new plants. Why did we use bromothymol blue in this experiment. Gregory filesbio%20101bio%20101%20laboratoryphotosynthesisp0000143. Basics of the elodea lab for learning about movement of water inout of cells. All organisms are dependent on a healthy carbon dioxideoxygen balance. Remember to use the thermocouple to measure temperature as well. Pdf growth and nutrient uptake by two species of elodea in. Jan 23, 2014 basics of the elodea lab for learning about movement of water inout of cells.
Sprig of elodea distilled water w baking soda test tube or clear glass timer or watch. View a prepared slide of elodea anacharis, which is an aquarium plant. Lakes were slowgrowing in the lab initially compared to parental species, but. Elodea plants are native to the new world, though a number of species have established themselves as invasive. Also, if the light is closer, the process will be faster. Because the leaves of elodea are only a few cells thick, they will be easy to observe under the microscope to look at cells and cell parts. Lab 7 photosynthesis introduction in order to survive, organisms require a source of energy and molecular building blocks to construct all of their biological molecules. The elodea method has been a common class room demonstration for at least 100 years jost. Objectives upon completion of the lab, students should be able to 1. For improved accessibility in moving files, please use the move to dialog option found in the menu.
You are comparing the 7cm to the 7cm in the light intensity lab and. Observe what happens to the shape and size of the cell. Photosynthesis and respiration in elodea teacher section. Obtain the elodea a few days in advance of the lab and enhance growth with an artificial. Bromthymol blue is used as an indicator for the presence of co2 in solution. Egeria densa, also known as elodea densa, is the most popular aquatic plant used to teach photosynthesis in the classroom. Most likely you have knowledge that, people have see numerous period for their favorite books in the same way as this elodea onion cheek cell lab answers, but stop. In the first part, you will use the weight of pieces of potato to see how much water moves in and out of cells in different salt solutions. In which direction did the water move through the cell membrane when the cell was surrounded by the hypertonic solution. Elodea is a submerged, freshwater perennial, generally rooted on the bottom in depths of up to 20 feet or drifting.
Because the leaves of elodea are only a few cells thick, they will be. Before and after finishing the second experiment, the cod, n total. The amount of baking soda has been premeasured for you. What was the color of the bromothymol blue solution before you exhaled into it.
Short term it can be kept in a shallow tray covered with water. Pdf the oxygen transfer capacity of submerged plant elodea. To view your own human cheek cells under the microscope. To demonstrate that carbon dioxide is produced during respiration. Predict how the amount of chloroplasts in a leaf cell would compare to those in a root cell. Elodea definition is any of a small american genus elodea of submerged aquatic monocotyledonous herbs. Answer the following questions using complete sentences before beginning the lab.
Explain why phenol red can be used to provide evidence of a plants carbon fixation. More amount of time under the light will cause the plant to give out more glucose and o2. Carbon transfer through snails and elodeavirtual lab. Exploring photosynthesis measuring dissolved oxygen from. Pdf for many years, salinity of freshwaters increases due to. Determine whether water represented as blue arrows moves into, stays in equilibrium, or moves out of the cell. Elodea primarily reproduces by stem fragmentation and rarely by seed. Overabundant growth of elodea is a symptom of excessive nutrients phosphorus and nitrogen in the pond water. Carbon transfer through snails and elodea virtual lab. This is a 3 page lab with background info, materials list, clear pr. Pdf there are insufficient data for the development of process design. In the second part, you will observe plasmolysis in an aquatic plant, elodea. Elodea responds best when placed in nonchlorinated h20 with an aerator.
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