Affect of Different Colored Lights on Photosynthesis

 Most light sources we use are of two kinds: The light is created either by heat--e.g.

Effect of Different Colored Lights on Photosynthesis

Photosynthesis occurs in two stages. In the first stage, light-dependent reactions or light reactions capture the energy of light and use it to make the energy-storage molecules ATP and NADPH. During the second stage, the light-independent reactions use these products to capture and reduce carbon dioxide. Most organisms that utilize photosynthesis to produce oxygen use visible light to do so, although at least three use infrared radiation.

Thus gratings can separate a beam of light into its colors the way prisms do, and they are often used in spectroscopes.

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Although photosynthesis can happen in different ways in different species, some features are always the same. For example, the process always begins when energy from light is absorbed by proteins called photosynthetic reaction centers that contain chlorophylls. In plants, these proteins are held inside organelles called chloroplasts, while in bacteria they are embedded in the plasma membrane. Some of the light energy gathered by chlorophylls is stored in the form of adenosine triphosphate (ATP). The rest of the energy is used to remove electrons from a substance such as water. These electrons are then used in the reactions that turn carbon dioxide into organic compounds. In plants, algae and cyanobacteria this is done by a sequence of reactions called the Calvin cycle, but different sets of reactions are found in some bacteria, such as the reverse Krebs cycle in Chlorobium. Many photosynthetic organisms have adaptations that concentrate or store carbon dioxide. This helps reduce a wasteful process called photorespiration that can consume part of the sugar produced during photosynthesis.

There are many pigments in plants, not just chlorophyll, and plants can make use of light of any colour.

Light Filters are used and
light intensity stays the same The colors used in order of wavelength
blue being the smallest and red the largest so the order will go
white, blue, green, yellow, orange, red.

Which colors of light are most effective for photosynthesis? Explain why. They are in the red and blue/violet range.


Light Absorption for Photosynthesis - HyperPhysics …

Use metal halides or a mix unless you are just supplementing natural light.

HPS is waaaayyyy better in efficiency than flourescents or metal halide in terms of lumen output but it is in a restricted spectrum that isn't always suitable on its own, certainly not for most cacti although I'd bet that Pereskiopsis would just love it.

10/01/2018 · Light Absorption for Photosynthesis ..

Mostly these wavelengths are towards the blue and green end of the spectrum, at the red end it is mostly just chlorophyll making sugar.

Plant light sellers make a big deal out of the chlorophyll absorption spectrum and how green light is useless.

PHOTOSYNTHESIS - School City of Hobart

Our results are contradictory with our hypothesis, based on our statistical results. There were several problems with our experiment that could have been taken into consideration. First, when taking respiration rates the foil wasn’t covering the chamber all the way letting some external light in. Second, the colored cellophane only allows approximately 70% of light through; this might have prevented the plant from absorbing the amount of light energy needed to have a significant photosynthetic rate. Third, the fast paced moving between trials lost time and efficiency. By having short trials (2.5 min.) we might not have allowed the plant enough time to adjust its photosynthetic rate to the different wavelengths of light energy. Plus by moving the plant, and switching from cellophane to foil (or vise versa), might have screwed up the photosynthetic cycle by exposing it to white light.

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Thanks for the great question! It turns out that plants use the portion of the solar spectrum that falls in the visible range (400 - 700 nm wave length) of the light spectrum. In other words, plants use all of the different colors of light that we can actually see to generate biological energy through photosynthesis. Also, in case you are interested, the visible range of the solar spectrum makes up about 45% of the total solar spectrum, meaning that plants can only use about half of the sun's emitted energy for photosynthesis.