We use cookies to give you the best experience possible. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product. Don't use plagiarized sources. The procedure for this would be to leave the Elodea plant in water with sodium bicarbonate baking soda increases carbon dioxide in waterset up the lamp at 5cm distance and start the timer for 3 minutes.

Overall results are that after 9 minutes 3 minutes intervals between the light distancethe solution gave off 4 bubbles. Remove several leaves from around the cut and of the stem. Slice off a portion of the stem at an angle and lightly crush the cut end of the stem. Place a small pinch of sodium bicarbonate into a test tube this increases carbon dioxide in water Fill the test tube with distilled water so that the stem is completely submersed.

Place the plant into a beaker. Place a source of light 5cm from plant. Wait a minuteAfter one minute, count and record the number of oxygen bubbles rising from the cut end of the stem for 3 minutes.

If bubbles fail to appear after one minute, repeat part A. Run a second 3 minute trail at 10cm from light sources lamp. Record results. Run a third 3 minute trail with at a 15cm distance from a light source and record results. Graph results. However, it was not due to the closeness of the lamp but to the amount of time under it. Also, the plant was heated up towards the end and it gave results, even though the distance between the plant and lamp was greater.

Some possible mistakes that could have occurred during this experiment can include the following: Miscalculating the distance between the Elodea plant and the light source. Putting in too much water. Putting in too much sodium bicarbonate. Elodea plant may be dry or not developed. Water may have been contaminatedLeaving the Elodea plant in too long or too littleNot cutting the Elodea plant correctlyConclusion:Hypothesis is declined.

It was not exact to the results given, therefore I marked it incorrect. It was only due to time, not distance. It is true that if we left the lamp in a position of 5cm distance, same result could have been given faster. Yet the experiment gave out the 3 minute interval rule.

During the experiment, I learned the role of Sodium Bicarbonate and that photosynthesis can happen very quickly. Photosynthesis in Elodea Lab Essay. Accessed April 14, This is just a sample. You can get your custom paper from our expert writers. All you need to do is fill out a short form and submit an order.

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How Many Pages? Sign Up and See Pricing.Photosynthesis is the process by which plants take carbon dioxide from the atmosphere, add water, and use the energy of sunlight to produce sugar. Photosynthesis occurs in the chloroplast, an organelle in plant cells that contains the molecule chlorophyll.

Chlorophyll absorbs the energy of sunlight. That light energy is converted to chemical energy through the steps of photosynthesis.

The reactions of photosynthesis can be divided into two major types: light-dependent reactions and light-independent reactions.

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The light-dependent reactions convert energy from the sun into a form that the chloroplast can then use to make sugar from carbon dioxide, in the process producing oxygen as a waste product. The light-independent reactions use that energy to make glucose from carbon dioxide and water. There are various set-ups that can be used to measure the rate of photosynthesis, each relies on counting the oxygen produced during the reaction. To improve results, add a pinch of baking soda to the water in the test tube.

Cut elodea stems at an angle and use your fingers to crush the end of the stem. The water in the beaker is meant to absorb the heat from the light. Design 1 : Heat sinks beaker with water may not be necessary if using CFL bulbs.

Count the bubbles to measure the rate of reaction. Design 3 : A marker can be used to measure the amount of oxygen in the test tube rather than measuring bubbles. If you do not see bubbles right away, re-cut and crush the stems, experiment with moving the light closer to the apparatus or remove the heat sink if using CFL bulbs.

Your goal is to find a way to consistently measure the rate of photosynthesis using any of the designs above. With the members of your group, brainstorm variables which may affect the rates of photosynthesis.

Form a hypothesis to test your variable. Design an experiment to test your hypothesis. After discussing your plan with your instructor, perform your experiment. Record all data and determine if your data supports or refutes your hypothesis. Include the following sections in your lab report, which should be typed.

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You may also include photos of your experiment. Introduction: Explain photosynthesis and include the chemical equation. Discuss the experimental set-up and how it can be used to measure the rate of photosynthesis. Photosynthesis Experiment: Describe your experiment, include your hypothesis and data collected.

Answer your experimental question or hypothesis by using your data to support or refute your claim conclusion. Conclusion: This section should summarize your overall findings and discuss any experimental errors or problems you encountered. This is also a good place to include any personal thoughts about your learning experience.

Design 2 : The test tube can be inverted and the air pocket can be measured.Investigate the effect of light intensity on the rate of photosynthesis using an aquatic organism such as pond weed. Greg Foot explains the effect of temperature, light intensity and carbon dioxide concentration on the rate of photosynthesis. The effect of light intensity on photosynthesis can be investigated in water plants. Use Cabomba or Elodeawhich are sold in aquarium shops.

The plants will release bubbles of oxygen - a product of photosynthesis - which can be counted. A lamp with an LED bulb is set up at different distances from the plant in a beaker of water. The bubbles produced over one minute periods are recorded. To investigate the effect of light intensity on the rate of photosynthesis. Care must be taken when using water near electrical equipment. Ensure that your hands are dry when handling the lamp.

The volume of oxygen produced could be measured by collecting the gas produced in a gas syringe. The changes in the oxygen or carbon dioxide concentration in the water could be measured using datalogging equipment. You could investigate the effect of different wavelengths of light on photosynthesis. Use coloured acetate filters to investigate the effects of the blue, green and red parts of the spectrum on photosynthesis.

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The effect of the presence or absence of chlorophyll on photosynthesis can be investigated using a variegated plant. Variegated plants have regions of their leaves with and without chlorophyll. Only those areas of the leaf with chlorophyll photosynthesise.

why is elodea used?

They will test positive for starch, which is built up from the glucose produced. Care must be taken when using boiling ethanol. Make sure that no Bunsen burners are turned on as the ethanol is highly flammable. To investigate if a plant needs carbon dioxide for photosynthesis, we need to create conditions for the plants where carbon dioxide is present in one test and absent in another. The air contains 0. Scientists can use sodium hydroxide to absorb carbon dioxide from the air so that it is unavailable for the plants to use in photosynthesis.

In this particular experiment, a de-starched plant is covered using a transparent plastic bag or a glass jar. The chemical, sodium hydroxide, is placed in the bag with the plant to absorb the carbon dioxide. The plant is left for 24 hours and the leaves are tested for starch using iodine. The leaves will show that no starch has been made, as no photosynthesis has occurred.

What is the purpose of a control in this experiment? The control is a comparison to show the results with and without sodium hydroxide; all other variables are kept the same. It shows it is the sodium hydroxide removing the carbon dioxide that affects the production of starch and not any other factor.

Practical - Investigation of factors affecting photosynthesis Investigate the effect of light intensity on the rate of photosynthesis using an aquatic organism such as pond weed.Activity Dependency: Do Plants Eat? All About Photosynthesis. Although no charge or fee is required for using TeachEngineering curricular materials in your classroom, the lessons and activities often require material supplies. The expendable cost is the estimated cost of supplies needed for each group of students involved in the activity.

Most curricular materials in TeachEngineering are hierarchically organized; i. Some activities or lessons, however, were developed to stand alone, and hence, they might not conform to this strict hierarchy. Related Curriculum shows how the document you are currently viewing fits into this hierarchy of curricular materials. Bubbles can be produced by many things, even plants.

Students perform data analysis and reverse engineering to understand how photosynthesis works. Both are important aspects of being an engineer. Each TeachEngineering lesson or activity is correlated to one or more K science, technology, engineering or math STEM educational standards. In the ASN, standards are hierarchically structured: first by source; e. Support an argument that plants get the materials they need for growth chiefly from air and water. Grade 5. Do you agree with this alignment?

Thanks for your feedback! Alignment agreement: Thanks for your feedback! Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.

Grades 6 - 8. View aligned curriculum. Through a teacher-led discussion, students realize that the food energy plants obtain comes from sunlight via the plant process of photosynthesis.

By counting the number of bubbles that rise to the surface in a five-minute period, students can compare the photosynthetic activity of Elodea in the pre Students are introduced to the concept of energy cycles by learning about the carbon cycle.

Students learn about photosynthesis and cellular respiration at the atomic level and study the basic principles of electromicrobiology—a new field of research that may enable engineers to harness energy at the molecular level. By studying key processes in the carbon cycle, such as photosynthesis, composting and anaerobic digestion, students learn how nature and engineers "biorecycle" carbon.

Students are exposed to examples of how microbes play many roles in various systems to recycle organic materials and also learn howAlso if you want to show how different light intensity etc can affect photosynthesis, you can change the light intensity and clearly see the what speed the bubble come off the Elodea at.

I did that experiment! I warn you - its boring. Anyway, there are several reasons for you using Elodea, otherwise known as Canadian pond weed don't know why. Firstly, it's cheap, and you can get it from any garden centre. Secondly photosynthesises very quickly, and the effects of light shining on it can be seen within a few seconds.

Thirdly, as its a water plant, you can see bubbles rising from the leaves - oxygen from the photosynthetic process, so by counting the number of bubbles, and measuring the volume of oxygen produced, you can quantify the rate of photosynthesis easily.

Hope that helps! Elodea certainly does photosynthesise and produces oxygen which you can see bubbling up from the leaves - assuming you keep it under water as you would do in a fish tank. Usually, when a microscope is available, the cells of elodea leaves are known for their vivid exhibition of cyclosis, or cytoplasmic streaming. Chloroplasts make use of cytoplasmic streaming to move to optimum position within the cell for maximum light absorption used in photosynthesis. The rate of motion is usually affected by light exposure, temperature, and pH levels.

Otherwise: Elodea will grow in a wide range of conditions, from very shallow to deep water, and in many sediment types.

It can even continue to grow unrooted, as floating fragments. It is found throughout temperate North America, where it is one of the most common aquatic plants. It is an attractive and easy to keep aquarium plant. Elodea is a genus of aquatic plants often called the Water weeds. Elodea is native to North America and it is also widely used as aquarium vegetation.

The introduction of some species of Elodea into waterways in parts of Europe, Australia, Africa, Asia, and New Zealand has created a significant problem, and it is now considered a noxious weed in these areas. American waterweed is an important part of lake ecosystems.

It provides good habitat for many aquatic invertebrates and cover for young fish and amphibians. Waterfowl, especially ducks, as well as beaver and muskrat eat this plant. Also, it is of economic importance as an attractive and easy to keep aquarium plant.

10 Lead Weighted Bunches of Elodea Densa Oxygenating Pond Plant

It was used as a drug by the Iroquois. Answer Save. Elodea also known as Canadian pond weed, is a water plant which, is easy and cheap to obtain. Rozzy Lv 4. What do you think of the answers? You can sign in to give your opinion on the answer.

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It's known for making oxygen in sunlight, is that something eles? Still have questions? Get answers by asking now.Plants perform photosynthesis to create sugars and other organic compounds that they need to survive. Chlorophyll is a pigment in the chloroplast of the plant cell that absorbs energy from light and uses it to create compounds needed in photosynthesis.

why is elodea used in photosynthesis experiment

Visible light is made up of different colors of different wavelengths and energy. Certain wavelengths of light are used by plants more than others. Plants use carbon dioxide and produce oxygen gas during photosynthesis.

They produce carbon dioxide during cellular respiration. In this experiment, the student will place aquatic plants under different colors of light in a solution of bromothymol blue.

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Bromothymol blue is an acid-base indicator that turns yellow in acidic solutions and blue in alkaline solutions. Carbon dioxide bubbled into water forms carbonic acid. Thus, the more photosynthetic activity, the less acidic and more blue the bromothymol blue solution becomes as the plant uses carbon dioxide during photosynthesis.

The less photosynthetic activity, the more acidic and yellow the bromothymol blue solution becomes as the plant produces carbon dioxide during cellular respiration. Bookmark this to easily find it later. Then send your curated collection to your children, or put together your own custom lesson plan. Please note: Use the Contact Us link at the bottom of our website for account-specific questions or issues. My Education. Log in with different email For more assistance contact customer service.

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why is elodea used in photosynthesis experiment

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Middle School. Elodea Photosynthesis Lab. Science project.A recorded pest on rivers and canals in the UK, particularly in the 19th century. Its distribution was aided by botanic gardens both in Britain and mainland Europe, and is now found widespread in all areas south of the Arctic, including Australia and New Zealand. Obtaining : Easily available from aquarium shops or pet shops that have aquarium section, and specialist science suppliers such as Blades Biological.

A care sheet can be downloaded from them too. Care : Blades Biological provide care information for both the pondweeds Elodea and Cabomba. They also supply both plants. Elodea can be kept living in an aquarium long term if anchored with gravel it should then begin to grow. Short term it can be kept in a shallow tray covered with water. There are currently no resources associated with this article - perhaps you could suggest one.

Sign up now. Using Elodea in the Lab. Practicals Teaching topics Description Growing and sourcing Curriculum links This North American pondweed is widely recommended for demonstrating oxygen formation during photosynthesis. Elodea is cheap and easy to grow, but we find that Cabomba is a much more reliable plant for this purpose. One common way is to gather bubbles of gas given off by an aquatic plant. However, Cabomba is a more reliable plant and much more effective than the traditional Elodea.

Growing and sourcing Obtaining : Easily available from aquarium shops or pet shops that have aquarium section, and specialist science suppliers such as Blades Biological. Download Resources There are currently no resources associated with this article - perhaps you could suggest one.

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Photosynthesis Lab Procedure - Biology

Post Topic Adaptation. Agriculture and farming. Climate change. Ecology and evolution. Fertilisation and cell cycles. Inheritance and genetics. GM and Selective breeding. Movement in and out of cells. Nutrient cycles. Plant cells and tissues. Plant growth, health and reproduction. Plant nutrition. Plant responses and hormones. Products of plants. Respiration in plants. Transport in plants. Plant disease.

why is elodea used in photosynthesis experiment

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