﻿ What color light is mostly used in photosynthesis

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## in sunlight are not all used equally in photosynthesis.

That is that the photosynthetic rate depends on how much energy the wavelength is carrying and the level it is absorbed at.

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# Photosynthesis Flashcards | Quizlet

This data was compared to that of the standard action spectrum for photosynthesis of visible light (this profiles the relative effectiveness of different wavelengths of radiation in driving the process of photosynthesis).

Red will have a very high photosynthetic rate
as even though it has the longest wavelength and therefore carries the
least energy it will be greatly absorbed so a lot of the light energy
will be used rater than reflected.

## Central wavelengths of Red and NIR regions are used in calculating ..

[This is not expected; 650 nm (red) and 475 nm (blue) should produce the fastest rates]

2) The wavelength 475 nm (blue) does not induce photosynthesis whatsoever when shone on discs of spinach leaves.

When we started this lab, we expected the highest rates of photosynthesis to be at the wavelengths of 475 nm (blue light) and 650 nm (red light), and the lowest to be at 510 nm (green light) and 570 nm (yellow light) due to the action spectrum of visible light.

## of the wavelength can be used efficiently for photosynthesis.

As we can see, there is a close relationship between the action spectrum and absorption spectrum of photosynthesis. There are many different types of photosynthetic pigments which will absorb light best at different wavelengths. However the most abundant photosynthetic pigment in plants is chlorophyll and therefore the rate of photosynthesis will be the greatest at wavelengths of light best absorbed by chlorophyll (400nm-525nm corresponding to violet-blue light). Very little light is absorbed by chlorophyll at wavelengths of light between 525nm and 625 (green-yellow light) so the rate of photosynthesis will be the least within this range. However, there are other pigments that are able to absorb green-yellow light such as carotene. Even though these are present in small amounts they allow a low rate of photosynthesis to occur at wavelengths of light that chlorophyll cannot absorb.

Anoxygenic photosynthetic and oxygenic photosynthetic organisms use different electron donors for photosynthesis. Moreover, anoxygenic photosynthesis takes place in only one type of reaction center, while oxygenic photosynthesis takes place in two, each of which absorbs a different wavelength of light, according to Govindjee and Whitmarsh. However, the general principles of the two processes are similar. Below are the steps of photosynthesis, focusing on the process as it occurs in plants.

• ### How Plants Use Light | Garden Guides

In this experiment, the released oxygen will be used to measure photosynthesis rates in discs cut from spinach leaves.

• ### How can the answer be improved?

Chloroplast: Chloroplast, structure within the cells of plants and green algae that is the site of photosynthesis.

• ### Light Absorption for Photosynthesis - HyperPhysics …

Bright light is a basic element of photosynthesis, but variations in the color of light have an effect on plants

## What wavelengths of light do plants use ..

The plot of the absorption spectra of the chlorophylls plus correlates well with the observed photosynthetic output. The measure of photochemical efficiency is made by meauring the amount of oxygen produced by leaves following exposure to various wavelengths.

## They absorb light maximally at wavelengths between ..

It is evident from these absorption and output plots that only the red and blue ends of the part of the are used by plants in photosynthesis. The reflection and transmission of the middle of the spectrum gives the leaves their green visual color.

## At which wavelength does maximum Photosynthesis take ..

Photosynthesis is the ability of plants toabsorb the energy of light, and convert it intoenergy for the plant. To do this, plants havepigment molecules which absorb the energy of lightvery well. The pigment responsible for mostlight-harvesting by plants is chlorophyll, a greenpigment. The green color indicates that it isabsorbing all the non-green light-- the blues(~425-450 nm), the reds and yellows (600-700 nm). Red and yellow light is longer wavelength, lowerenergy light, while the blue light is higherenergy. In between the two is green light(~500-550 nm). It seems strange that plantswould harvest the lower energy red light insteadof the higher energy green light, unless youconsider that, like all life, plants first evolvedin the ocean. Sea water quickly absorbs thehigh-energy blue and green light, so that only thelower energy, longer wavelength red light canpenetrate into the ocean. Since early plants andstill most plant-life today, lived in the ocean,optimizing their pigments to absorb the reds andyellows that were present in ocean water was mosteffective. While the ability to capture thehighest energy blue light was retained, theinability to harvest green light appears to be aconsequence of the need to be able to absorb thelower energy of red light.

## Photosynthesis is the ability of plants to ..

Photosynthesis occurs inside chloroplasts. Chloroplasts contain chlorophyll, a green pigment found inside the thylakoid membranes. These chlorophyll molecules are arranged in groups called photosystems. There are two types of photosystems, Photosystem II and Photosystem I. When a chlorophyll molecule absorbs light, the energy from this light raises an electron within the chlorophyll molecule to a higher energy state. The chlorophyll molecule is then said to be photoactivated. Excited electron anywhere within the photosystem are then passed on from one chlorophyll molecule to the next until they reach a special chlorophyll molecule at the reaction centre of the photosystem. This special chlorophyll molecule then passes on the excited electron to a chain of electron carriers.

## Chlorophyll a absorbs light with wavelengths of 4 ..

Current understanding is that the earliest photosynthetic organisms were aquatic bacteria, some of which are still around today. One of these, halobacterium halobium, grows in extremely salty water. It makes use of the bacteriorhodopsin pigment. The chlorophyll system developed to use the available light, as if it developed in strata below the purple bacteria and had to use what it could get.

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