Do plants to photosynthesis in the dark? We shall prove the Gauss-Markov theorem using the simple regression model of equation 1. Now we already know that plants absorb carbon dioxide and release oxygen. Allow the plants to remain under the lamps until the uncovered control has turned dark blue about 24-48 hours. Carbon dioxide bubbled into water forms carbonic acid. CompareyourRateofPhotosynthesistotheaverageratesreportedbyother students in Table 3, if possible.
Certain wavelengths of light are used by plants more than others. Visible light is made up of different colors of different wavelengths and energy. But, when you put the solution along with the fish and the elodea in the dark, the plant can no longer absorb the carbon dioxide so the solution turns yellow. Why is the Elodea rinsed in distilledwater? Put in light for 3 hours. Therefore, the carbonic acid is produced the solution changes colors.
Place a piece of elodea in each test tube or glass. Thus, the more photosynthetic activity, the less acidic and more blue the bromothymol blue solution becomes as the plant uses carbon dioxide during photosynthesis. So, when you put the aquarium fish and the elodea together in the solution in the light, the solution remains blue-green because the plant absorbs the carbon dioxide the fish breathes out, keeping it neutral. In order for photosynthesis to occur sunlight and chlorophyll must be present. What molecule was produced by the Elodea while it was exposed to light? Howdoesphotosynthesis and respirationrelate to this controversy? So here is a lab that I created based off of the observations and facts. Secure the film with tape.
Do plants do cellular respiration in the dark? Record the final color of the bromothymol blue solution for each color of light, as well as both controls. Was the initialhypothesis supported or refuted? Put an aquarium fish in with the mixture. Bromothymol blue is an acid-base indicator that turns yellow in acidic solutions and blue in alkaline solutions. A test tube was filled ¾ with water 5. Aretheylocatedinthe order that you expected? Carbon C was shown as a black solid 2. However, it is important to understand the Gauss-Markov theorem on two grounds: 1. They help us understand how life works under certain conditions.
Therefor this turns the solution yellow. Onthebargraph,labelthe calculated Rf with the name of the associated chlorophyll pigment. One reason this lab is great is because it can be used in multiple places in your curriculum: ~ Cells unit: When you are teaching cells, chances are you will be talking about chloroplasts and mitochondria. One nugget of information you will need to know- pet stores call it anacharis, not elodea. Thenmeasurethis distance to the top of the solvent front and record. Photosynthesis reduced the amount of carbon dioxide in the atmosphere, as oxygen was continually being released. The reactions of photosynthesis can be divided into two major types: light-dependent reactions and light-independent reactions.
Students will use higher-order thinking skills as they design their experiment, analyze their data and draw conclusions. The Carbon Dioxide was in a gas state. Do plants do photosynthesis in the light? The next day we came in and saw both flasks were a shade of bluish green somewhere in the middle of where the two flasks began. Elodea was cut up into a 10cm length piece and bottom of stem was cut off allowing water to flow through the xylem use the same piece, allowing more accurate results 2. Gently blow into the tube using a straw until it changes color to yellow. What gas did you add to the Bromothymol blue solution? Set up the lamps at least several feet apart and away from windows. The key concept for this investigation is that plants use carbon dioxide, water and sunlight to make glucose, oxygen and water during the process of photosynthesis.
This is because when the carbon dioxide in our breath reacts with the water it forms carbonic acid, lowering the pH. Variables Independent Variable Concentration of carbon dioxide Dependent Variable Rate of photosynthesis in spinach leafs Controlled Variable -Light intensity -Temperature of the carbon dioxide water solution -pH of the carbon dioxide water solution -Concentrations of carbon dioxide in distilled water 0%, 1%, 2%, 2% and 4% -Volume of distilled water Control Group:. 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. Put an elodea in the mixture. Remind students that when animals eat plants they too are eating the food that the plants produced. What term could be applied to the second trial? Whatdidyouobservewhenyourepeatedtheexercisewiththetesttubecontaining the Elodea wrapped in aluminum foil? Before beginning the lab, I like to demonstrate to the students how bromothymol blue works. Where was the O2 in the flask? Do plants do cellular respiration in the light? We may treat the world of the Gauss-Markov theorem as equivalent to the world of perfect competition in micro economic theory.
If not, which chlorophyll pigments are missing? This is due to the fact that animals respire in the form of carbon dioxide, which in water becomes carbonic acid. Nameatleastthreeexperimentalvariables thatcouldexplainwhyyouroutcomemightvary from that of other students or from your own, if you repeated the experiment. What caused the sugar to be able to change into other substances? Prior experience in setting up a controlled experiment would be helpful for this lab. Materials test tube elodea straw 25 ml bromothymol blue scissors Procedure 1. A glass funnel was placed in the beaker, along with the elodea as shown in the apparatus above 4. The less photosynthetic activity, the more acidic and yellow the bromothymol blue solution becomes as the plant produces carbon dioxide during cellular respiration. This activity will be used prior to any direct instruction for photosynthesis.