Name the 2 controlled variable When light shines on pondweed, Elodea sp, bubbles of gas are released. The rate at whichbubbles of gas are produced can be used to measure the rate of photosynthesis. An investigationwas carried out to study the effect of different colours of light on the rate of photosynthesis in thepondweed.The apparatus was set up as shown in the diagram below.The pondweed was exposed to one colour of light and left for 5 minutes beforemeasurements were taken.The time taken for the release of 20 bubbles were recorded.The procedure was repeated using light of different colours but of equal intensity.BubblesWaterPondweedIndependentThe results are given in the table below.Colour of lightdependantTime (in seconds) for 20 bubbles toformViolet80Green40Blue160Red140Yellow701.1Provide the aim for this investigation.1.2Provide a hypothesis for this investigation.1.3Name the dependent variable1.4Name the independent variable1.5Name two controlled/ fixed variables.1.6Name two ways how the above investigation could be made more reliable.1.7Name two ways how the above investigation could be made more valid.1.8Provide a conclusion for the above investigation.1.9Oraw a bar cranh of the results shoun in the table

A scientific experiment includes independent, dependent and controlled variables.

When light shines on pondweed, Elodea sp, bubbles of gas are released. The rate at which bubbles of gas are produced can be used to measure the rate of photosynthesis. An investigation was carried out to study the effect of different colours of light on the rate of photosynthesis in the pondweed. The apparatus was set up as shown in the diagram below. The pondweed was exposed to one colour of light and left for 5 minutes before measurements were taken. • The time taken for the release of 20 bubbles were recorded. The procedure was repeated using light of different colours but of equal intensity. Bubbles Water Pond weed

When light shines on pondweed, Elodea sp, bubbles of gas are released. The rate at which bubbles of gas are produced can be used to measure the rate of photosynthesis. An investigation was carried out to study the effect of different colours of light on the rate of photosynthesis in the pondweed. The apparatus was set up as shown in the diagram below. The pondweed was exposed to one colour of light and left for 5 minutes before measurements were taken. • The time taken for the release of 20 bubbles were recorded. The procedure was repeated using light of different colours but of equal intensity. Bubbles Water Pond weed

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter8: Photosynthesis

Section: Chapter Questions

Problem 2ITD

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Photosynthesis directly opposes respiration in determining how plants influence atmospheric CO2 concentrations. When a leaf is in the light, both photosynthesis and respiration are occurring simultaneously. The data in the Table were collected from the leaf of a sagebrush plant that was enclosed in a chamber that measures the rate of CO2 exchange. The same leaf was used to collect the data in Interpret the Data in Chapter 7. Respiration is shown as a negative and photosynthesis as a positive rate of CO2 exchange. The net photosynthesis rate is the amount of CO2 (in micromoles per square meter per second) assimilated by the leaf while respiration is occurring; a positive value indicates more photosynthesis is occurring than respiration. The light exposed to the leaf is quantified as the number of photons in the 400 to 700 nm wavelength, the photosynthetic photon flux density (PPFD); 2,000 mol/m2/s is equivalent to the amount of light occurring at midday in full Sun. Observation Photosynthetic Photon Flux Density (PPFD) (mol/m2/s) Net Photosynthesis (mol/m2/s) 1 2,000 9.1 2 1,500 8.4 3 1,250 8.2 4 1,000 7.4 5 750 6.3 6 500 4.8 7 250 2.2 8 0 -2.0 Why is net photosynthesis negative when PPFD is zero? Looking at the respiration data from Interpret the Data in Chapter 7, at what temperature do you think these data were collected? Source: Data based on unpublished research by Brent Ewers, University of Wyoming.
Figure 8.18 Which of the following statements is true? In photosynthesis, oxygen, carbon dioxide, ATP, and NADPH are reactants. G3P and water are products. In photosynthesis, chlorophyll, water, and carbon dioxide are reactants. G3P and oxygen are products. In photosynthesis, water, carbon dioxide, ATP, and NADPH are reactants. RuBP and oxygen are products. In photosynthesis, water and carbon dioxide are reactants. G3P and oxygen are products.
Figure 8.6 On a hot, dry day, plants close their stomata to conserve water. What impact will this have on photosynthesis?
Where in plant cells does the Calvin cycle take place? a. thylakoid membrane b. thylakoid space c. stroma d. granum
Melvin Calvin and Andrew Benson determined the steps in the light-independent reactions of photosynthesis by exposing the green alga Chlorella to CO2 labeled with the radioisotope carbon 14. By looking at which compounds the C14 ended up in, they were able to identify all intermediates in this cyclic pathway. Why did they predict correctly that the same set of intermediates would be formed in the light reaction in land plants?
Match each term with its most suitable description. ____ PGAL formation a. absorbs light ____CO2 fixation b. converts light to chemical energy ____ autotroph c. self-feeder ____ ATP forms NADPH does not d. electrons cycle back to photosystem ____ photorespiration e. problem in C3 plants ____ photosynthesis f. Calvin-Benson cycle product ____ pigment g. water molecules split ____ photolysis in photosynthesis h. rubisco function
Which of the following statements is incorrect? a. Pigments absorb light of certain wavelengths only. b. Many accessory pigments are multipurpose molecules. c. Chlorophyll a is green because it absorbs green light.
When discussing why the rate of photosynthesis did not increase at higher light intensities, the investigator mentioned the possibility that high light intensities could damage chlorophyll, which would result in a decrease in oxygen production. Which of the following accurately explains the role of chlorophyll in oxygen production during photosynthesis and why damage to chlorophyll would results in lower oxygen production? Select one or more: a. Chlorophyll participates in carbon fixation during the Calvin Cycle. During this process, oxygen molecules are formed. b. Chlorophyll captures energy from sunlight and releases high energy electrons that enter the electron transport chain in the Calvin Cycle. During this process, oxygen molecules are formed. c. Chlorophyll participates in carbon fixation during the light reactions. During this process, oxygen molecules are formed. d. Chlorophyll captures energy from sunlight and releases high energy electrons that enter the electron…
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How would you design an experiment to test the following hypothesis: " The optimal temperature for photosynthesis in spinach leaves is 20 degrees Celsius?"
Create a concept map for this. Include all terms. “Photo” Portion of Photosynthesis (“Light Reactions”): Chloroplast, Grana, Thylakoid, Sunlight, Chlorophyll, Photosystem II(ETC), Photosystem I (ETC), High Energy electrons, Proton Gradient, ATP, NADPH, Water, Oxygen, Hydrogen Ions (H+), ADP, NADP+ Use all terms listed. Make as many connections as you can. Be sure your maps are clear.
With a diagram trace the movement of electron during the LRP of photosynthesis.