IB Biology Notes - 8.2 Photosynthesis

25/03/2013 · What wavelengths of light are most effective for photosynthesis

photosynthesis notes - Biology Junction

Fig.9 An experiment with illustrating the production of chromo proteins insufficient for photosynthesis, and intensity for optimal illumination for this species.

Chlorophyll absorbs light in the red and violet wavelengths,and uses this energy for photosynthesis.

Free rate of photosynthesis Essays and Papers - …

Phycobilins absorb in
Biol 171L – FA15 Effect of Light Color on Photosynthesis 7-4
the green and orange portion of the spectrum and are important for allowing marine and aquatic
plants to harvest the wavelengths not filtered out by the water.
PHOTOSYNTHESIS AND RESPIRATION
The process of photosynthesis involves the use of light energy to convert carbon dioxide
and water into sugar, oxygen, and other organic compounds.

literature on the internet and on LED lamp websites it is obvious that there is little understanding about which wavelengths plants use for photosynthesis

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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.

It has been calculated and proofed experimentally that the optimum wavelength for previtamin D photosynthesis in solution is 296 nm ..


BBC - Higher Bitesize Biology - Photosynthesis : …

Humans visually perceive any object as the sum of its reflected light and the object's intrinsic emission (an object is considered light emitting if its total emission at a certain wavelength range is higher than the falling light energy in that same region). Usually objects only reflect light, and their color is determined by the ratio, in which different wavelengths falling on its surface are adsorbed or reflected. For example, green leaves adsorb all visible wavelengths except for green, which is reflected - therefore we perceive it as green. When an object not only reflects but also emits its own light, the eye combines the emitted and reflected light spectrum into its perceived color. Yielding color depends on the ratio of the intensities and wavelengths of both reflected and emitted light. This color addition is best illustrated by the diagram shown in Fig. 7:

29/12/2017 · Photosynthesis exam skills

This conclusion matches well with the experimental research in this field [16]. Fragments of colony were maintained for six weeks under comparable amounts of red, green, and blue light. The conclusion of the article is that "the enhancement of coral pigmentation is primarily dependent on the blue component of the spectrum and regulated at the transcriptional level," and "light-driven accumulation of GFP-like proteins observed upon green light exposure is likely due to residual blue light passing the green filter." The experiments also revealed that radiation in the 430nm range is most efficient in promoting the protective bright coloration of the corals:"Among the known FPs and CPs, only the absorption properties of CFPs spectrally match the major absorption band of chlorophyll and at ~430 nm, making them suitable for effective shielding of the photosynthetic system of the zooxanthellae."

photosynthesis are nearer or at their optimum ..

Coral fluorescence is very beautiful but it is not always easy to observe it. Have a look at the luminous function (spectral sensitivity chart) of the human eye (Fig. 6). Light sensitive elements of the eye are represented by two cell types - the so-called retinal cones and rods. The first are responsible for distinguishing between colors, and the second - for grey tones. The cones work best during daytime, the rods - at night. Remember the saying "all cats are grey in the dark." This is just because we mainly see with the rods in the dark, rather than with cones. The rods do not distinguish between colors: they only sense the relative brightness of an object. The rods are most sensitive to the emerald-green part of the spectrum, with the wavelength of about 510nm (of course, when seeing by the rods, this light is only perceived as a brighter shade of gray rather than green.

rate of photosynthesis over the same range of wavelengths.

A light source could be best characterized, perhaps, by spectral distribution of the optical radiation energy at different wavelengths. This characteristic is usually represented by the spectral curve. For most common light sources, however, the spectral characteristic is usually unavailable, and instead an estimated light flux is provided, in lumens.