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Effects of different colors of light on the photosynthesis rate.

Does different colored lights affect the growth of plants?

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Science Fair Projects - Do different colors of light affect ..

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You will also do an absorption spectrum of the photosynthetic pigments extracted
from Elodea and determine if there is a correlation between the rates of photosynthesis
under the different colored bulbs, the wavelengths of light that those filters transmit, and
the optimum wavelengths of light absorbed by the plant.
Biol 171L – FA15 Effect of Light Color on Photosynthesis 7-5
EXPERIMENT PROCEDURE
Overview
You will work in groups, as directed by your TA, and each group will take one part of the
experiment.

The objective: My objective is to find out how different light colors affect plant growth

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.)

How Do Different Colors of Light Affect ..

Light therapy studies have found that different light colors affect moods, ..

Light - Visible light waves are broken into different colors: violet, indigo, blue, green, yellow, orange, and red. Blue light waves have a faster frequency than red lights. Humans cannot see light waves that are too fast, like ultraviolet, or too slow, like infrared.
Light has three characteristics that affect plant growth: quantity, quality, and duration. Plants react to different light colors (quality) in different ways. Green light is least effective to plants since most plants absorb very little and reflect it back. This is why most plants look green. Blue light is responsible for leaf growth. Red and blue light combined has the greatest effect on plant growth and encourages flowering. Red light helps plants germinate. Light quantity means how bright the light is, and duration is the length of the day.

The Effects of Different Colored Lights on Algal Oxygen ProductionPhotosynthesis Background Resources











How do different colored lights affect the ..

of oxygen through photosynthesis if different colored lights are used ..

The standard method for determining light requirements for corals' zooxanthellae has been examination of absorption characteristics of photopigments such as chlorophyll , chlorophyll etc. (good) or action spectrums (better). Both are not without problems. Absorption characteristics are usually based on pigments extracted in solvents. Spectral characteristics shift slightly according to the extraction solvent used, and photopigments, when combined, also change these characteristics slightly. A better way is to examine the action spectrum of zooxanthellae isolated from a stony coral. This is usually done with a monochromator, where a beam of pure color (hue) illuminates a culture of dinoflagellates and a reaction is determined (such as oxygen evolution). A chart of wavelengths versus reaction is then made. See Figure 1. This method also suffers from deficiencies - the two Photosystems (I and II) absorb light wavelengths with difference efficiencies, hence a monochromator might stimulate one photosystem, but not the other, and photosynthesis might not proceed efficiently (although 'spill-over' - also called State Transitions 1 or 2 - could perhaps overcome this problem - something very much in the discovery phase for zooxanthellae.) See Kirk (2000) for further details on action spectrums.

Photosynthesis can only happen in the presence of light
energy and chlorophyll.
We often think of
sunlight as a single
“white” wavelength, but
in reality it is a continuum
of wavelengths – each
wavelength representing a
different color of light.
(Figure 1).

21/05/2014 · The collected data sheds light on how different spectra affect photosynthesis ..
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  • Can Colored Lights Affect How Plants Grow?

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The purpose of this experiment is to see if light color affects phototropism and growth of lima bean seedlings. I have read about experiments that show the effect of light on phototropism, and about experiments that use different colored lights to measure plant growth, but I have not seen the two combined. I became interested in this when I went on a nature hike in the mountains. A tree was growing out of a cave from a granite boulder, and it was bending towards the light. If we could change the conditions that plants grow in, maybe we can improve crops.

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Effect of different colors of light on the rate of photosynthesisThe effect of different lights on plant growth: incandescent light, fluorescent light, sunlight and black light.

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Everyone knows plants are food factories, and most are aware that their energy source is light. This transformation of light into food is called photosynthesis. What may be news to you, however, is that the color of the light has a measurable impact on the amount of energy a plant absorbs. The reason for this is the colors in light have different wavelengths and those wavelengths, depending on whether they are short or long, provide different levels of energy.

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Knowing that different colors of light can affect what a plant does is important in a world that depends on plants for food. Advanced LED technology is now making it possible to control the kinds of colored light we provide plants in controlled environments.

Plant Energy Transformations-Photosynthesis - …

Fenton, Sharon. "Schools OnLine. How do different colours of light affect photosynthesis and the growth of plants, particularly algae?" Centre for Science Education, School of Sciences and Mathematics, Sheffield Hallam University, Sheffield, United Kingdom, June 10, 1998. Online December 30, 2001.
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