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Section 16.3 Photosynthetic Stages and Light-Absorbing Pigments

Links to pigments (chlorophyll and carotenoids) and linksto light provide absorption spectra of chlorophylls and carotenoids.

Assignment Assignmentfor Laboratory Exercise 7 -- Photosynthesis1. Examine the materials on display in the room.

 The light used in photosynthesis is absorbed by a green pigment called chlorophyll.

Some plants and plantlike organisms have developed other pigments to compensate for low light or poor use of light. Cyanobacteria and red algae have phycocyanin and allophycocyanin as accessory pigments to absorbe orange light. They also have a red pigment called phycoerythrin that absorbs green light and extends the range of photosynthesis. The red pigment is found in vegetables. Some red algae are in fact nearly black, so that increases their photosynthetic efficiency. Brown algae have the pigment fucoxanthin in addition to chlorophyll to widen their absorption range. These red and brown algae grow to depths around 270 meters where the light is less than 1% of surface light.

to reveal the various pigments used in photosynthesis and the ..

So the photosynthesizing leaf loses substantial amount of water by evaporation.

You will do exercise 7 at the start of the lab period after watchinga short film on photosynthesis, then as time allows, you will work on exercise6 (Leaf).

in plants is dependent upon capturing light energy in the pigment , and in particular chlorophyll a. This chlorophyll resides mostly in the and gives leaves their green color. The range of light absorption in leaves is extended by some such as the , but does not cover the entire visible range - that would make the leaves black!

Pigment color and photosynthesis of leaves? | Yahoo …

Plants use more than one photosynthetic pigment to absorb light. This maximises the use of energy from the Sun. These pigments include:

For photosynthesis to occur, plants need: · Light energy from the sun · Chlorophyll to absorb light energy · Carbon dioxide from the atmosphere and from respiration in plant cells · Water which is absorbed by the roots and transported to the leaves by the xylem tubes....

Photosynthesis is summarised by the


However this equation is somewhat miss leading, as photosynthesis is a
two-stage process.

Light energy is trapped in the chloroplast lamellae by photosynthetic pigments which are either chlorophylls e.g.
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are the main photosynthetic pigments

Thus, shaded leave having adaptations for capturing the
low intensities of sunlight are not designed for optimal
photosynthesis when given full exposure to direct sunlight.

Investigating photosynthetic pigments through TLC

Moreover enzymes have an optimum pH at which they work
at, if the soil is too acidic or to alkaline, this will denature the
enzymes, which will affect the rate of photosynthesis and affect the
size of the leaf.

Some pigments in leaves--such as the ..

A plant that is grown in full sun often produces leaves having a light
shade of green then the same plant grown under low light intensity
(shaded plants) in part this is attributable to different portions of
the two chlorophyll pigments, because chlorophyll b is very abundant
in shaded leaves, to improve light capturing capability of the

12/01/2018 · Leaf Pigments Plants make an ..

In effect, the leaves are
larger so that as much sunlight can be trapped in order for
photosynthesis to take place at a suitable rate for the plant to

a and b, are the pigments of photosynthesis.

If the leaves have a larger surface area they would absorb a large
amount of light energy and this will increase the rate of
photosynthesis provided that there are no other limiting factors such
as availability of water.

BBC - GCSE Bitesize: Photosynthetic pigments - Higher …

During these reactions the photosynthetic pigments of the chloroplast
absorb light energy and give out excited electrons used to synthesise

Concentration of photosynthetic pigments and …

Applying ultra-violet visible spectrophotometry and various types of chromatography to compare the amounts of certain photosynthetic pigments in fresh, frozen, and canned phaseolus vulgaris and spinacia olercea.

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