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Photosynthesis Essay

1124 words - 4 pages

Photosynthesis

Photosynthesis produces energy in the form of glucose it uses water
from the soil, carbon dioxide from the air, and energy from the suns
light. Photosynthesis takes place in all plants that contain
chlorophyll. Photosynthesis mainly takes place in the palisade
mesophyll cell in the leaves of plants.

The main reaction is to produce oxygen and glucose, glucose is stored
in the form of starch and does not affect osmosis, taking place in the
plant. As plants respire both night and day this starch is often used
up during the night when photosynthesis cannot take place. The uses of
glucose within the plant are for active transpiration, cell division,
the production of protein and the production of cellulose. In
photosynthesis the raw materials are carbon dioxide and water. They
react to form the same products of the reaction of oxygen and starch
(glucose that has been stored). The reactions need energy and this
comes from light. The green chloroplasts allow light to be used as
energy and therefore both of these things are like helpers in the
reaction.

[IMAGE] 6CO2 + 6H2O C6H12O6 + 6C2
Carbon Dioxide Water Glucose Carbon

It is important that certain factors are present when the reaction is
occurring. We know that these are carbon dioxide, water, light and
Water, carbon dioxide and light, along with temperature, all have a
particular effect on the rate of photosynthesis. In terms of carbon
dioxide the levels in the atmosphere do not really alter very much,
but if gardeners wish to increase the rate of photosynthesis then
sometimes carbon dioxide is pumped into greenhouses. Up to a certain
point as temperature goes up so does the rate of reaction. After it
reaches a certain point though the enzymes involved in the reaction
become denatured and stop working properly. The final factor, which
contributes, is light. We decided to investigate how this affects the
rate of reaction also.

Method
======

We need to find out how the of presence light and the intensity
contributes to the rate of photosynthesis. To be able to measure the
rate we need a visible sign that photosynthesis is taking place. We
will use Canadian pondweed. By counting these bubbles we can tell how
fast oxygen is being given off from the photosynthesis. We will place
the Elodea in a beaker along with warm water and a bit of Sodium
Hydrogen Carbonate (NaHCO3). If it wasn't there then another limiting
factor may be the cause of the rate changing instead of just light.

By placing the beaker next to a lamp we can change the light
intensity. The weed will be given a set number of minutes each time to
adjust to the new level of...

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