According to the graph below which wavelength of light would be the best for growing plants?
Drawing a bar graph from the given data – 4th grade math
The visible light spectrum is the portion of the electromagnetic spectrum that can be seen through the naked eye. This spectrum of wavelengths is referred to as visible light. The human eye can detect wavelengths ranging from 380 to 700 nanometers in most cases.
Since all electromagnetic radiation is light, we can only see a small portion of it, which we refer to as visible light. Our eyes have cone-shaped cells that serve as receivers for wavelengths in this narrow band of the spectrum. Other sections of the spectrum have wavelengths that are either too large or too short and energetic for our biological limitations.
Since each color is a different wavelength, as the full spectrum of visible light passes through a prism, the wavelengths divide into the rainbow colors. Violet has the shortest wavelength (around 380 nanometers), while red has the longest (around 700 nanometers).
(On the left) A prism bends visible light, and each color refracts at a slightly different angle depending on the wavelength of the color, according to Isaac Newton’s experiment in 1665. Troy Benesch is responsible for this picture. (Left) A rainbow’s colors refer to various wavelengths in the electromagnetic spectrum.
Pigments in plants:types and functions
When pigments consume light energy, the process of photosynthesis begins. Organic pigments can only consume a limited range of energy levels. Lower energy levels than those indicated by red light are insufficient to excite an orbital electron to a quantum state. Bleaching occurs when energy levels greater than those in blue light physically break the molecules apart. Retinal pigments, for example, can only “see” (absorb) visible light between 700 nm and 400 nm. Plant pigment molecules absorb only light in the wavelength range of 700 nm to 400 nm for the same reasons; this range is referred to by plant physiologists as photosynthetically-active radiation.
The visible light we perceive as white light is actually a rainbow of colors in the electromagnetic spectrum, with violet and blue having shorter wavelengths and therefore more energy. The wavelengths are longer and have lower energy at the other end of the spectrum, toward red.
Rates of photosynthesis – gcse science required practical
Plants don’t use green light for photosynthesis; they represent it, according to popular belief. This is only partially right. Although most plants reflect green light more than any other color in the visible spectrum, only a small percentage of green light passes through or is reflected by the leaves. Green light is primarily used in photosynthesis. Plants use wavelengths between 300 and 800 nm effectively, as shown by the relative quantum efficiency curve (Photo 1). Green light is the wavelength of light that is used the least efficiently in the visible spectrum.
Michigan State University Extension studied how different wavebands of light (blue, green, and red) from LEDs affected seedling growth in a series of experiments conducted in enclosed environments. For four to five weeks at 68 degrees Fahrenheit, we grew tomato ‘Early Girl,’ salvia ‘Vista Red,’ petunia ‘Wave Pink,’ and impatiens ‘SuperElfin XP Red’ in growth chambers under 160 molm-2s-1 of LED or fluorescent light. B25+G25+R50 (25 percent light from blue and green LEDs and 50 percent from red LEDs); B50+G50; B50+R50; G50+R50; R100; and B100 were the percentages from each LED color.
Gcse science revision biology “required practical 6
The spectral spectrum (wave band) of solar radiation from 400 to 700 nanometers that photosynthetic organisms can use in the process of photosynthesis is known as photosynthetically active radiation, or PAR. This spectral area roughly corresponds to the visible spectrum of light to the human eye. Photons with shorter wavelengths are more energetic and can damage cells and tissues, but they are mostly filtered out by the stratospheric ozone layer. Longer wavelength photons do not have enough energy to enable photosynthesis to occur.
Some living species, such as cyanobacteria, purple bacteria, and heliobacteria, can take advantage of solar light in slightly expanded spectral regions like the near-infrared. These bacteria can be found in places like the bottoms of stagnant ponds, sediment, and the waters of the ocean. They produce vibrant green, red, and purple mats due to their pigments.
The most abundant plant pigment, chlorophyll, is the most effective at absorbing red and blue light. Green light is harvested by accessory pigments like carotenes and xanthophylls and passed on to the photosynthetic phase, but enough of the green wavelengths are reflected to give leaves their distinctive color. Autumn is an exception to chlorophyll’s predominance since chlorophyll is degraded (since it includes N and Mg) but accessory pigments are not (since they only contain C, H, and O) and remain in the leaf, resulting in red, yellow, and orange leaves.