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Descripción
Mapa Mental por Mayra Baez, actualizado hace más de 1 año
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Creado por Mayra Baez
hace casi 4 años
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Photosynthesis
- What is it?
- Is the process by which plants
and certain other organisms
transform light energy into chemical
energy
- Is the process by which plants
and certain other organisms
transform light energy into chemical
energy
- What is their function?
- light energy is captured and used to
convert water, carbon dioxide, and
minerals into oxygen and energy-rich
organic compounds.
- Factors that Influence
of Photosynthesis
- Light intensity and temperature
- Carbon dioxide
- Water
- Minerals
- Light intensity and temperature
- light energy is captured and used to
convert water, carbon dioxide, and
minerals into oxygen and energy-rich
organic compounds.
- Why is important?
- Maintenance the life on Earth
- If photosynthesis ceased,
there would soon be little
food or other organic matter
on Earth
- Most organisms would disappear,
and in time Earth’s atmosphere
would become nearly devoid of
gaseous oxygen
- Maintenance the life on Earth
- History
- The study of photosynthesis began in 1771 with
observations made by the English clergyman
and scientist Joseph Priestley
- Priestley placed a sprig of mint plant in the container
until the air could no longer support combustion, in a
few days the mint had produced some substance (later
recognized as oxygen)
- In 1779 the Dutch physician Jan Ingenhousz
expanded upon Priestley’s work
- showing that the plant had to be exposed to light if
the combustible substance (i.e., oxygen) was to be
restored
- In 1782 it was demonstrated that the
combustion-supporting gas (oxygen) was formed
at the expense of another gas, or “fixed air,” which
had been identified the year before as carbon
dioxide
- in 1804 showed that the gain in weight of a plant
grown in a carefully weighed pot resulted from the
uptake of carbon, which came entirely from
absorbed carbon dioxide, and water taken up by
plant roots
- In the 1930s Dutch biologist Cornelis van Niel
recognized that the utilization of carbon dioxide to
form organic compounds was similar in the two types
of photosynthetic organisms
- showing that the plant had to be exposed to light if
the combustible substance (i.e., oxygen) was to be
restored
- Priestley placed a sprig of mint plant in the container
until the air could no longer support combustion, in a
few days the mint had produced some substance (later
recognized as oxygen)
- The study of photosynthesis began in 1771 with
observations made by the English clergyman
and scientist Joseph Priestley
- The overall reaction
- the “light” stage,
consisting of
photochemical recations
- the “dark” stage,
comprising chemical
reactions controlled by
enzymes
- the “light” stage,
consisting of
photochemical recations
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