Personal photosynthesis. Oxygenic photosynthesis is the one explained previously,

Personal interest in the investigation:

The reason why I chose to explore this topic is because
botany was always my area of interest as I have always been previously working
on such projects during my school career as a student. I have always been
interested and amazed by the sea and its oxygen productivity as I have always
been taught that the ocean is the lung of the earth. Algae have different
pigments that can photosynthesise in different depths where different
wavelengths of light are available.

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Research Question:

Is there a
difference between photosynthetic rate in the plant Ludwigia palustris when exposed to different light colors?



When Ludwigia palustris is exposed to
different light colors, it will photosynthesis differently, the highest rate
expected under normal light and lowest rate under green light.



The highest
level of photosynthesis is when normal light is turned on and when the
combination of different wavelengths is present while it is known that the
chlorophyll will reject green light and the level of photosynthesis is
therefore low.

Background Research


Photosynthesis is the most important chemical reaction
conducted in plants, algae and certain bacteria in order to transfer energy
from light energy or in other words sunlight energy to chemical energy. This
process happens as green plants contain chlorophyll which attracts the sunlight
and is used to convert water carbon dioxide and other minerals into energy rich
organic compounds and oxygen that we breathe in everyday. There are two types
of photosynthetic processes and they are oxygenic photosynthesis and anoxygenic
photosynthesis. Oxygenic photosynthesis is the one explained previously, the
most common and is seen in plants, algae and cyanobacteria. During oxygenic
photosynthesis, light energy transfers electrons from water (H2O)
to carbon dioxide (CO2), which produces carbohydrates. In this transfer, the CO2 is
reduced, and the water becomes “oxidized,” or loses electrons.
Ultimately, oxygen is produced along with carbohydrates. On the other hand,
anoxygenic photosynthesis uses electron donors other than water. The process
typically occurs in bacteria such as purple bacteria and green sulfur bacteria.
“Anoxygenic photosynthesis does not produce oxygen — hence the name,” said
David Baum, professor of botany at the University of Wisconsin-Madison. “What
is produced depends on the electron donor. For example, many bacteria use the
bad-eggs-smelling gas hydrogen sulfide, producing solid sulfur as a
byproduct.”Though both types of photosynthesis are complex, multistep affairs,
the overall process can be neatly summarized as a chemical equation. Oxygenic
photosynthesis is written as follows:


6CO2 +
12H2O + Light Energy ? C6H12O6 +
6O2 + 6H2O

Figure 1: “Photosynthesis.” Khan Academy,


Here, six molecules of carbon dioxide (CO2)
combine with 12 molecules of water (H2O)
using light energy. The end result is the formation of a single carbohydrate
molecule (C6H12O6, or glucose) along with six molecules each of breathable
oxygen and water. Similarly, the various anoxygenic photosynthesis reactions
can be represented as a single generalized formula:


CO2 +
2H2A + Light Energy ? CH2O
+ 2A + H2O




In photosynthesis, the sun’s energy is converted to chemical
energy by photosynthetic organisms. However, the various wavelengths in
sunlight are not all used equally in photosynthesis. Instead, photosynthetic
organisms contain light-absorbing molecules called pigments that absorb only
specific wavelengths of visible light, while reflecting others. The set of
wavelengths absorbed by a pigment is its absorption spectrum In the diagram
below, you can see the absorption spectra of three key pigments in
photosynthesis: chlorophyll a, chlorophyll b, and ?-carotene. The
set of wavelengths that a pigment doesn’t absorb are reflected, and the
reflected light is what we see as color. For instance, plants appear green to
us because they contain many chlorophyll a and b molecules, which
reflect green light.