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provides the initial energy needed for photosynthesis to occur

Below are things that plants need for photosynthesis:

Carbon dioxide (A colorless, naturally occurring odorless gas found in the air we breathe. It has a scientific symbol CO2. CO2 is produced by burning carbon and organic compounds. It is also produced when plants and animals breathe out during respiration)

Water

Light (Even though both natural and artificial light is OK for plants, natural sunlight is usually great for photosynthesis because they have other natural UV properties that help the plant)

Chlorophyll (This is the green pigment found in the leaves of plants)

Nutrients and minerals (Chemicals and organic compounds which the plant roots absorb from the soil)

The further away the light, the slower the oxygen bubbles will be produced so the less light the less photosynthesis will occur which is needed for the plant to make food....

Apr 12, 2008 · Why are chloroplasts needed for photosynthesis to occur

LabBench Activity Plant Pigments and Photosynthesis

[No change will occur because sunlight is required for photosynthesis to occur.] Ask the students to describe what they observe.

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.

So how can these factors have an effect on the rate of photosynthesis? Lets start off with the light intensity. When the light intensity is poor, there is a shortage of ATP and NADPH, as these are products from the light dependent reactions. Without these products the light independent reactions can't occur as glycerate 3-phosphate cannot be reduced. Therefore a shortage of these products will limit the rate of photosynthesis. When the carbon dioxide concentration is low, the amount of glycerate 3-phosphate produced is limited as carbon dioxide is needed for its production and therefore the rate of photosynthesis is affected. Finally, many enzymes are involved during the process of photosynthesis. At low temperatures these enzymes work slower. At high temperatures the enzymes no longer work effectively. This affects the rate of the reactions in the Calvin cycle and therefore the rate of photosynthesis will be affected.

plants must make use of respiration when light is not available

Algae are a very diverse group of predominantly aquatic photosynthetic organisms that account for almost 50% of the photosynthesis that takes place on Earth. Algae have a wide range of antenna pigments to harvest light energy for photosynthesis giving different types of algae their characteristic colour. Early work done with algae contributed much to what is presently known about the carbon dioxide fixation pathway and the light harvesting reactions. The processes of photosynthesis in algae and higher plants are very similar. From among the three types of carbon dioxide‐concentrating mechanisms known in photosynthetic organisms, two types are found in different types of algae. Algae are proposed to play a role in the global carbon cycle by helping remove excess carbon dioxide from the environment. Recently, algae are recognized as a promising biodiesel source due to its efficient absorption and conversion of solar energy into chemical energy.

Plants need to be adapted so that maximum light energy is absorbed and therefore maximum photosynthesis occurs.

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....

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the ATP needed for photosynthesis is produced in the mitochondria


IB Biology Notes - 8.2 Photosynthesis

Sunlight provides energy for the reaction.

Photosynthesis occurs in the chlorophyll - the light-absorbing pigment within chloroplasts (the organelle where PS occurs).

Free rate of photosynthesis Essays and Papers - …

Calcium concentrations in normal, most-recently matured leaves will be from 1.0% to 5.0%. Deficiencies, however, can occur temporarily under certain environmental conditions as discussed above. Therefore, it is important to consider irrigation and greenhouse environment control in the overall Ca fertilization program. In addition, uptake of Ca can be affected by other ions such as NH4, Mg, and K. These cations can compete with Ca for uptake by the root. These competing nutrients should not be supplied in excess of what is needed by the plant.

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