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The rate of photosynthesis in blue and red light doesn't change
These results may seem perplexing if we take the adage 'a photon is a photon' to be correct, and the color of light (or more correctly, its energy level) does not make a difference in photosynthesis (which is true.)
The coral was allowed to dark-acclimate overnight before minimum chlorophyll fluorescence (Fo) and maximum fluorescence (Fm - through application of a photosynthetically-saturating pulse of light) were determined. The coral was then exposed to light intensities that were incrementally adjusted upwards, and Fm' (maximum chlorophyll fluorescence while illuminated) measurements were made 15-20 minutes after light intensity was increased. Yields of Photochemistry, Non-Photochemical Quenching (of chlorophyll fluorescence) and NO (other energy dissipation pathways) were determined. When the Yield of any of these processes is multiplied by the light intensity level (PPFD, or Photosynthetic Photon Flux Density, as determined by a PAR meter), we can arrive at an estimate of the relative electron flow from Photosystem II to Photosystem I. The electron flow is called ETR for Electron Transport Rate. Since we did not measure the amount of light actually absorbed by the coral and its symbionts, this is called the Relative ETR, or rETR. The coral's zooxanthellae were allowed to acclimate to darkness for 20-30 minutes after each round of testing.
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I think this because the plant may use up all of the carbon dioxide (Sodium hydro carbonate) and the plant can have as much light as it needs but if it does not have any carbon dioxide it will not be able to photosynthesise....
The following sections describe light bandwidths, the light sources used in the procedures (in great detail), and the photosynthetic responses of a coral's zooxanthellae to these light sources. If this is not of particular interest, skip to the Discussion section.
Blue and Red Light in Photosynthesis - excite Deutschland
Xanthophylls: Oxygenated carotenoids. Important xanthophylls found in zooxanthellae are diadinoxanthin and diatoxanthin - these play an important role in protecting them from excessive light. Dinoxanthin is an accessory pigment that transfers collected energy to dinoflagellates photosystems (with an unknown efficiency) and might act as an antioxidant as well.
This process is also affected by the temperature surrounding the plant (the species of plant we experimented with, pond weed, photosynthesised best at around 20 degrees centigrade.) Light, temperature & CO2 are known as limiting factors, and each is as important as the next in photosynthes...
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Photosynthesis and colour of light - Marked by Teachers
The further away the light, the slower the oxygen bubbles will be produced so the less light the less photosynthesis will occur which is needed for the plant to make food....
Effects of red and blue light on the rate of photosynthesis.
are molecules that bestow color on plants, algae and bacteria, but they are also responsible for effectively trapping sunlight. Pigments of of light. Below are the three main groups.
Photosynthesis dictionary definition | photosynthesis …
This article will examine photosynthetic efficiencies of various LEDs. Specifically, six light sources were tested for photosynthetic responses by zooxanthellae found in the stony coral (most likely of Clade C15.) The light sources include a black light (mostly UV-A produced by a fluorescent lamp), and LEDs radiating energy at peaks of 400nm (UV-A/violet), a 418nm LED (producing mostly violet with a small amount of UV-A), a blue/white LED combination peaking at white light with a peak 443nm and 457nm, a 'white' LED with a blue peak at 443nm, and red LEDs producing maximal light at 631nm and 657nm. All tests were performed when light intensity was at sub-saturating levels. Evidence suggests absorption by carotenoids is responsible for lessened photosynthetic efficiencies at 450 nm and 470 nm.
Photosynthesis - Blue Orange Games - All games
SeaWiFS satellite image showing chlorophyll content in the ocean. This image was an average of images taken in June 1998. The bright green and yellow colours indicate high levels of chlorophyll. From Feldman . Image provided by the SeaWiFS Project, NASA, Goddard Space Flight Center and ORBIMAGE.
Photosynthesis | Definition of Photosynthesis by …
Action Spectrum: The rate of physiological activity (such as oxygen production resulting from photosynthesis) plotted against wavelength of light. See Figure X for an action spectrum of zooxanthellae from a stony coral.
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Background information: Photosynthesis Photosynthesis is the process of autotrophs turning carbon dioxide and water into carbohydrates and oxygen, using light energy from sunlight.
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