The figure below an apparatus for measuring net photosynthesis by measuring the change in CO2 concentrations when a leaf is put into an illuminated chamber. Why might you also measure the change in CO₂ concentration in the dark? Is this statement correct, incorrect or irrelevant answer to the question. Measuring photosynthesis through a decrease in CO2 (CO2 uptake by the plant) over a short time in the light can help one create an estimate of gross primary productivity. In order to estimate net primary activity one needs to measure the decrease in CO₂ in the chamber in the dark to estimate energy loss through respiration Light source (a) Light O irrelevant O incorrect correct Sealed chamber Carbon dioxide sensor Leaf CO₂ CO₂ (b) Dark CO₂ Relyea, Ecology, 9e, © 2021 W. H. Freeman and Company

The figure below an apparatus for measuring net photosynthesis by measuring the change in CO2 concentrations when a leaf is put into an illuminated chamber. Why might you also measure the change in CO₂ concentration in the dark? Is this statement correct, incorrect or irrelevant answer to the question. Measuring photosynthesis through a decrease in CO2 (CO2 uptake by the plant) over a short time in the light can help one create an estimate of gross primary productivity. In order to estimate net primary activity one needs to measure the decrease in CO₂ in the chamber in the dark to estimate energy loss through respiration Light source (a) Light O irrelevant O incorrect correct Sealed chamber Carbon dioxide sensor Leaf CO₂ CO₂ (b) Dark CO₂ Relyea, Ecology, 9e, © 2021 W. H. Freeman and Company

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.
Rubisco can bind with CO2 or 02. When it binds with O2, it "wastes" some of the energy captured from the sun. This reaction is photorespiration and is favored at high temperatures and low CO2:02 ratios. Which of the following strategies should limit photorespiration (select all that apply). Keep stomata closed. Keep stomata open. Physically separate the light and light-independent reactions. Temporally separate CO2 uptake and fixation.
using a 14CO2 fixation assimilation method,a plant is found to be fixing carbon at a rate of 140mgh-1 .dm-2 leaf area in the sunlight. In darkness the same plant is losing 30mgh-1.dm-2 . Calculate the photosynthetic capacity of the plant and state with reasons to which photosynthetic type the plant belongs
Which among the following is not a raw material of light dependent reactions of photosynthesis? Light ATP+Pi NADP+ NADPH
Absorption Chlorophyll a Chlorophyll s 400 450 500 550 600 650 700 Wavelength (nm) Plant chlorophyll chemicals will absorb, or take in, light wave eniergy in arder to produce ther molecules used for cellular energy. Reflected light refers to those wovelengths of light thet will of the chlorophyll and not be absorbed. Select the conclusion that most accurately summarizes the data in diagram 3. Red and blue light waves have equal importance during photosynthesis. The majority of light energy is attained from red light, while the blue light waves provide additiicn photosynthesis. The majority of light energy is attained from blue light, while the red light waves provide ado photosynthesis. O Medium length light waves are important to photosynthesis
Refer to the graphs which were generated from photosynthesis rate data collected at varying temperatures from two species of plants measured under different CO2 levels. CO2 CO2 60 Y Y 50 40 30 20 10 15 20 25 30 35 40 45 50 15 20 25 30 35 40 45 50 Leaf temperature (°C) Match the correct labels to the graphs. Net photosynthesis (umol m-2 s-')
In the light dependent reactions of photosynthesis, light energy is converted into chemical energy. True False
A stoma (plural: stomata) is a tiny pore found on the underside of a leaf. When open, carbon dioxide can diffuse from the atmosphere, where it is present at approximately Catm= 0.70 mg/L, between the L = 5 μm thick guard cells, into the relatively well mixed air cavity within each stoma, and from the cavity into cells that consume it during photosynthesis. What is the mass flux of carbon dioxide into an open stoma that has a cross-sectional area of A = 2 μm2, a diffusion coefficient of D = 0.16 cm2/s, and a steady air cavity concentration of Cs = 0.04 mg/L?
Which of the following is NOT a product of the light reaction? Carbon dioxide OA. АТР OB. O,. Oxygen NADPH
Diagram 41 The Light Reactions of Photosynthesis STROMA Poteyte Potayate mples HAD Light HLARO ACE (high ir Carto Thylakold membrane ATP ynthase STROMA ow N concentration) ADP Diagram 4 shows a single thylakoid membrane taken from a chloroplast inside of a leaf cell. The events of the light dependent cycle that take place along the thylakoid membrane are shown. Identify an energy transfer that takes place n Diagram 4. Light energy is directly transferred into the chemical bonds of sugar. O Light energy is directly transferred into the chemical bonds of ATP The energy of the bonds of water are transferred into the chemical bonds of ATP. The energy from an excited electron is transferred into the chemical bonds of NADPH.
The maximum photosynthetic rate of a sun leaf is higher or lower than a shade leaf? Higher No answer text provided. Lower O No answer text provided.
Discuss whether it would be more beneficial to improve the light or dark reactions in order to enhance photosynthesis for a future scenario of extreme drought conditions. Please draw sketches to illustrate and include atleast 20 points