De-extinction Plant physiology Photosynthesis Light reaction & Calvin cycle Make
ID: 91815 • Letter: D
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De-extinction Plant physiology Photosynthesis Light reaction & Calvin cycle Make sure you're confident in all these areas - go back to your reading assignments and online units to help you prepare. The following are your potential essay questions: You are encouraged to prepare beforehand. You must put your answers in your own words and cite your sources. Due to global climate change and the increase in CO2 levels and a decrease in water and plants are having to adapt to the changes. For the following question and cite at least one peer reviewed source for full credit. 1. While the CO2 levels and the temperature increase, the water levels decrease. What effect will this have on the light reactions? and the Calvin cycle? 3. As the climate in certain areas becomes very hot and very dry explain how plants will need to evolve in order to handle the changes. Make sure to talk about leaves, roots, and stomata. A CSI lab tech has just completed as series of Kastle-Meyer tests on 3 red stains on a suspect's shirt and compared them to her positive and negative controls sample 1 the pink color appeared after 5 minutes after hydrogen peroxide was added. For sample 2 and 3 the pink appeared immediately after hydrogen added. Please answer the following questions: A) What is the result for each? How do you know? B) Why did the lab tech need to run a positive and negative control? what else would she need to do to ensure that all tests and procedures were being done correctly and the results are reliable?Explanation / Answer
1. With increase in carbon dioxide concentration, the rate of incorporation of carbon dioxide into carbohydrate is increased. Therefore, there will be increase in the overall increase in the rate of light reaction and subsequent reactions of photosynthesis. This will continue until water levels become limiting.
Light dependent reactions remain unaffected by temperature. However, subsequent reactions of photosynthesis are catalyzed by enzymes. When enzymes reach their optimum temperature level, the rate of photosynthesis increases. Above the optimum temperature, the photosynthetic rate starts decreasing.
When the water level is low and becomes limiting, the stomata will shut down. As a result, photosynthesis will cease.
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