Plant roots are adapted as storage organ( such as potatoes and carrots)Typically photosynthesize during the summer and remain dormant underground during winter. Explain how sugar transport in such a plant would be different during summer, when the plant is photosynthesizing and in the spring when new growth is coming up

Plant roots are adapted as storage organ( such as potatoes and carrots)Typically photosynthesize during the summer and remain dormant underground during winter. Explain how sugar transport in such a plant would be different during summer, when the plant is photosynthesizing and in the spring when new growth is coming up

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 Source: Data based on unpublished research by Brent Ewers, University of Wyoming.
In an oak tree leaf 80 feet above the ground a cell of the spongy mesophyll is Photosynthesizing explain how the rest of the tree is meeting the physiological needs of the cell.
The pathogenic fungus Fusicoccum amygdali secretes atoxin called fusicoccin that activates the plasma membrane proton pumps of plant cells and leads to uncontrolled water loss. Suggest a mechanism by which theactivation of proton pumps could lead to severe wilting.
In a lab, a scientist would like to explore the effect of solute concentration in the xylem on sugar transport in a plant. He adds salts and minerals to the xylem tissue to increase the solute concentration and a radioactive substance to the leaves that are incorporated into the sugars during photosynthesis. At some point he adds a substance to detect the radioactive material and finds that it is all still situated in the leaves and has not been transported to the sink. Explain, using the pressure flow or mass flow hypothesis why the sugar has not been transported to the sink (4).
the rate of photosynthesis in plants decreases due to clogged stomata of the leaves
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If plants need CO2 to construct glucose (by photosynthesis), why is the rising level of CO2 in the atmosphere cause for concern? You’d think more CO2 would accelerate plant growth, and that would be a good thing.
During photosynthesis, the synthesis of ATP is driven by the flow of H+ from the thylakoid lumen into the stroma via the enzyme ATP synthase. This synthesis of ATP in chloroplast achieved by a chemiosmotic mechanism is specifically called __________.
If a leaf disc is exposed to light but not to CO2, why would it not produce enough O2 to float?
Within the inner membrane of a chloroplast, interconnected sacs of membrane called ______ are suspended in a thick fluid called the ______. grana... thylakoid thylakoids... stroma thylakoids... grana chlorophyll... thylakoid
In C4 plants, CO2 fixation occurs by adding electrons and a hydrogen ion when splitting water in bundle sheath cells. by joining CO2 to a C3 molecule and pumping it into bundle sheath cells. by splitting water only in bundle sheath cells. by oxidizing a C4 molecule with O2 derived from bundle sheath cells.
In a photosynthetic investigation, a student measured the following pH of the stroma and the inner thylakoid compartments of spinach leaf cells at the conclusion of the experiment. Source of Fluid pH (mean) Standard Error of Mean (SEM) Stroma 8.2 0.75 Inner compartment of thylakoid 5.6 0.35 Describe the stages of photosynthesis. Explain the need for a constant supply of inorganic carbon dioxide.