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    what is the compensation point with relation to the release of co2 by the plants

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    What is compensation point ?

    What is compensation point ?

    Byju's Answer Standard X Biology Photosynthesis What is compe... Question

    What is compensation point ?

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    The (light) compensation point is the amount of light intensity on the light curve where the rate of photosynthesis exactly matches the rate of respiration.

    The point reached in a plant when the rate of photosynthesis is equal to the rate of respiration.This means that the carbon dioxide released from respiration is equivalent to that which is taken up during photosynthesis. The compensation point is reached as light intensity increases. If the light intensity is increased beyond the compensation point, the rate of photosynthesis increases proportionally until the point of light saturation is reached, beyond which the rate of photosynthesis is no longer affected by light intensity.

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    The compensation point of CO2 for C3 plants is

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    Compensation point

    Compensation point

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    Light and CO2 curves for notoginseng plants at different nitrogen levels. The compensation points is where the photosynthetic rate becomes zero.

    The light compensation point (c) is the light intensity on the light curve where the rate of photosynthesis exactly matches the rate of cellular respiration. At this point, the uptake of CO2 through photosynthetic pathways is equal to the respiratory release of carbon dioxide, and the uptake of O2 by respiration is equal to the photosynthetic release of oxygen. The concept of compensation points in general may be applied to other photosynthetic variables, the most important being that of CO2 concentration – CO2 compensation point (Γ).

    In assimilation terms, at the compensation point, the net carbon dioxide assimilation is zero. Leaves release CO2 by photorespiration and cellular respiration, but CO2 is also converted into carbohydrate by photosynthesis. Assimilation is therefore the difference in the rate of these processes. At a given partial pressure of CO2 (0.343 hPa in 1980 atmosphere[1]), there is an irradiation at which the net assimilation of CO2 is zero. For instance, in the early morning and late evenings, the light compensation point c may be reached as photosynthetic activity decreases and respiration increases. The concentration of CO2 also affects the rates of photosynthesis and photorespiration. Higher CO2 concentrations favour photosynthesis whereas low CO2 concentrations favor photorespiration, producing a CO2 compensation point Γ for a given irradiation.[2]

    Contents

    1 Light compensation point

    1.1 Depth

    2 CO2 compensation point

    3 The marine environment

    4 See also 5 References

    Light compensation point[edit]

    As defined above, the light compensation point c is when no net carbon assimilation occurs. At this point, the organism is neither consuming nor building biomass. The net gaseous exchange is also zero at this point.

    c is a practical value that can be reached during early mornings and late evenings. Respiration is relatively constant with regard to light, whereas photosynthesis depends on the intensity of sunlight.

    Depth[edit]

    For aquatic plants where the level of light at any given depth is roughly constant for most of the day, the compensation point is the depth at which light penetrating the water creates the same balanced effect.

    CO2 compensation point[edit]

    The CO2 compensation point (Γ) is the CO2 concentration at which the rate of photosynthesis exactly matches the rate of respiration. There is a significant difference in Γ between C3 plants and C4 plants: on land, the typical value for Γ in a C3 plant ranges from 40–100 μmol/mol, while in C4 plants the values are lower at 3–10 μmol/mol. Plants with a weaker CCM, such as C2 photosynthesis, may display an intermediate value at 25 μmol/mol.[3]: 463

    The μmol/mol unit may alternatively be expressed as the partial pressure of CO2 in pascals; for atmospheric conditions, 1μmol/mol = 1 ppm ≈ 0.1 Pa. For modeling of photosynthesis, the more important variable is the CO2 compensation point in the absence of mitochondrial respiration, also known as the CO2 photocompensation point (Γ*), the biochemical CO2 compensation point of Rubisco. It may be measured by whole-leaf isotopic gas exchange, or be estimated in the Laisk method using an intermediate "appearant" value of C* with correction.[4] C* approximates Γ* in the absence of carbon refixation, i.e. carbon fixation from photorespiration products. In C4 plants, both values are lower than their C3 counterparts. In C2 plants that operate by refixation, only C* is significantly lower.[5]

    As it is not yet common to routinely change the CO2 concentration of air, the concentration points are largely theoretical derived from modeling and extrapolation, though they do hold up well in these applications. Both Γ and Γ* are linearly related to the partial pressure of oxygen ((O2)) due to the side reaction of Rubisco. Γ is also related to temperature due to the temperature-dependence of respiration rates. It is also related to irradiation, as light is required to produce RuBP (ribulose-1,5-bisphosphate), the electron acceptor for Rubisco. At normal irradiation, there would almost always be enough RuBP; but at lwo irradiation, lack of RuBP decreases the photosynthetic activity and therefore affects Γ.[2]

    The marine environment[edit]

    Main article: Critical depth

    Respiration occurs by both plants and animals throughout the water column, resulting in the destruction, or usage, of organic matter, but photosynthesis can only take place via photosynthetic algae in the presence of light, nutrients and CO2.[6] In well-mixed water columns plankton are evenly distributed, but a net production only occurs above the compensation depth. Below the compensation depth there is a net loss of organic matter. The total population of photosynthetic organisms cannot increase if the loss exceeds the net production.[6][7]

    स्रोत : en.wikipedia.org

    Compensation point is

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    Question

    Compensation point is

    A

    Where there is neither photosynthesis nor respiration.

    B

    When rate of photosynthesis is equal to the rate of respiration.

    C

    When there is enough water just to meet the requirements of plant.

    D

    When the entire food synthesized in photosynthesis remains unutilized.

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    Updated on : 2022-09-05

    Solution Verified by Toppr

    Correct option is B)

    The (light) compensation point is the amount of light intensity on the light curve where the rate of photosynthesis exactly matches the rate of respiration.

    Compensation point :

    The compensation point is the amount of light intensity on the light curve where the rate of photosynthesis exactly matches the rate of respiration. At this point, the uptake of CO

    2 ​

    through photosynthetic pathways is exactly matched to the respiratory release of carbon dioxide, and the uptake of O

    2 ​

    by respiration is exactly matched to the photosynthetic release of oxygen.

    Timing :

    This point is reached during early mornings and late evenings. Respiration is relatively constant whereas photosynthesis depends on the amount of sunlight.

    Rate

    At the compensation point, the rate of photosynthesis is balanced to the rate of respiration so that the plant is neither consuming nor building biomass.

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