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Photosynthesis
Photosynthesis, process by which green plants
and certain other organisms use the energy of
light to convert carbon dioxide and water into the
simple sugar glucose. In so
doing, photosynthesis provides the basic energy
source for virtually all organisms. An extremely
important byproduct of photosynthesis is
oxygen, on which most organisms depend.
                                              Next
I.     Introduction
Photosynthesis occurs in green plants, seaweeds, algae, and
certain bacteria. These organisms are veritable sugar
factories, producing millions of new glucose molecules per
second. Plants use much of this glucose, a carbohydrate, as
an energy source to build leaves, flowers, fruits, and seeds.
They also convert glucose to cellulose, the structural material
used in their cell walls. Most plants produce more glucose
than they use, however, and they store it in the form of starch
and other carbohydrates in roots, stems, and leaves. The
plants can then draw on these reserves for extra energy or
building materials. Each year, photosynthesizing organisms
produce about 170 billion metric tons of extra
carbohydrates, about 30 metric tons for every person on earth.
                                                           Next
I.      Introduction
Photosynthesis has far-reaching implications. Like
plants, humans and other animals depend on glucose as an
energy source, but they are unable to produce it on their own
and must rely ultimately on the glucose produced by plants.
Moreover, the oxygen humans and other animals breathe is the
oxygen released during photosynthesis. Humans are also
dependent on ancient products of photosynthesis, known as
fossil fuels, for supplying most of our modern industrial energy.
These fossil fuels, including natural gas, coal, and
petroleum, are composed of a complex mix of hydrocarbons, the
remains of organisms that relied on photosynthesis millions of
years ago. Thus, virtually all life on earth, directly or
indirectly, depends on photosynthesis as a source of
food, energy, and oxygen, making it one of the most important
biochemical processes known.
                               Pleas click to go back to the category
II.   Where Photosynthesis
            occurs
III.   How Photosynthesis
             works
A. The Light-Depend Reaction
A. The Light-Depend Reaction
A. The Light-Depend Reaction
A. The Light-Depend Reaction
A. The Light-Depend Reaction
B. The Light-Independ reaction
B. The Light-Independ Reaction
IV. Photosynthesis variations
IV. Photosynthesis variations
Bacteria lack chloroplasts, and instead use structures called
chromatophores—membranes formed by numerous foldings
of the plasma membrane, the membrane surrounding the
fluid, or cytoplasm, that fills the cell. The chromatophores
house thylakoids similar to plant thylakoids, which in some
bacteria contain chlorophyll. For these bacteria, the process
of photosynthesis is similar to that of plants, algae, and
seaweed. Many of these chlorophyll-containing bacteria are
abundant in oceans, lakes, and rivers, and the oxygen they
release dissolves in the water and enables fish and other
aquatic organisms to survive.

                                                        Next
IV. Photosynthesis variations
  Certain archaebacteria, members of a group of primitive bacteria-like
  organisms, carry out photosynthesis in a different manner. The mud-dwelling
  green sulfur and purple sulfur archaebacteria use hydrogen sulfide instead of
  water in photosynthesis. These archaebacteria release sulfur rather than
  oxygen, which, along with hydrogen sulfide, imparts the rotten egg smell to
  mudflats. Halobacteria, archaebacteria found in the salt flats of deserts, rely on
  the pigment bacteriorhodopsin instead of chlorophyll for photosynthesis. These
  archaebacteria do not carry out the complete process of photosynthesis;
  although they produce ATP in a process similar to the light-dependent reaction
  and use it for energy, they do not produce glucose. Halobacteria are among the
  most ancient organisms, and may have been the starting point for the evolution
  of photosynthesis.
 While it may seem that we understand photosynthesis in detail, decades of
  experiments have given us only a partial understanding of this important
  process. A more thorough understanding of the details of photosynthesis may
  pave the way for development of crops that are more efficient at using the sun’s
  energy, producing food for increasingly bountiful harvests.
                                                                             Next
Photosynthesis
Photosynthesis
Sorry try Again!!!!!!
Congratulations!!!!!!!
Photosynthesis
Sorry try Again!!!!!!
Congratulations!!!!!!!
Photosynthesis
Nice Try!!!!!!
You Got It!!!!!!
Photosynthesis
Sorry,wrong answer!!!!!
Yehey,correct answer!!!!!
Question No.5
5.__________ are among the most ancient
  organism,and may have been the starting point
  for the evolution of photosynthesis.

A.Electrons          C.Bisphosphate

B.Halobacteria       D.Stroma
Try again!!!!!!
Correct Answer!!!!!!
Photosynthesis

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Photosynthesis

  • 3. Photosynthesis, process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose. In so doing, photosynthesis provides the basic energy source for virtually all organisms. An extremely important byproduct of photosynthesis is oxygen, on which most organisms depend. Next
  • 4. I. Introduction Photosynthesis occurs in green plants, seaweeds, algae, and certain bacteria. These organisms are veritable sugar factories, producing millions of new glucose molecules per second. Plants use much of this glucose, a carbohydrate, as an energy source to build leaves, flowers, fruits, and seeds. They also convert glucose to cellulose, the structural material used in their cell walls. Most plants produce more glucose than they use, however, and they store it in the form of starch and other carbohydrates in roots, stems, and leaves. The plants can then draw on these reserves for extra energy or building materials. Each year, photosynthesizing organisms produce about 170 billion metric tons of extra carbohydrates, about 30 metric tons for every person on earth. Next
  • 5. I. Introduction Photosynthesis has far-reaching implications. Like plants, humans and other animals depend on glucose as an energy source, but they are unable to produce it on their own and must rely ultimately on the glucose produced by plants. Moreover, the oxygen humans and other animals breathe is the oxygen released during photosynthesis. Humans are also dependent on ancient products of photosynthesis, known as fossil fuels, for supplying most of our modern industrial energy. These fossil fuels, including natural gas, coal, and petroleum, are composed of a complex mix of hydrocarbons, the remains of organisms that relied on photosynthesis millions of years ago. Thus, virtually all life on earth, directly or indirectly, depends on photosynthesis as a source of food, energy, and oxygen, making it one of the most important biochemical processes known. Pleas click to go back to the category
  • 6. II. Where Photosynthesis occurs
  • 7. III. How Photosynthesis works
  • 16. IV. Photosynthesis variations Bacteria lack chloroplasts, and instead use structures called chromatophores—membranes formed by numerous foldings of the plasma membrane, the membrane surrounding the fluid, or cytoplasm, that fills the cell. The chromatophores house thylakoids similar to plant thylakoids, which in some bacteria contain chlorophyll. For these bacteria, the process of photosynthesis is similar to that of plants, algae, and seaweed. Many of these chlorophyll-containing bacteria are abundant in oceans, lakes, and rivers, and the oxygen they release dissolves in the water and enables fish and other aquatic organisms to survive. Next
  • 17. IV. Photosynthesis variations Certain archaebacteria, members of a group of primitive bacteria-like organisms, carry out photosynthesis in a different manner. The mud-dwelling green sulfur and purple sulfur archaebacteria use hydrogen sulfide instead of water in photosynthesis. These archaebacteria release sulfur rather than oxygen, which, along with hydrogen sulfide, imparts the rotten egg smell to mudflats. Halobacteria, archaebacteria found in the salt flats of deserts, rely on the pigment bacteriorhodopsin instead of chlorophyll for photosynthesis. These archaebacteria do not carry out the complete process of photosynthesis; although they produce ATP in a process similar to the light-dependent reaction and use it for energy, they do not produce glucose. Halobacteria are among the most ancient organisms, and may have been the starting point for the evolution of photosynthesis.  While it may seem that we understand photosynthesis in detail, decades of experiments have given us only a partial understanding of this important process. A more thorough understanding of the details of photosynthesis may pave the way for development of crops that are more efficient at using the sun’s energy, producing food for increasingly bountiful harvests.  Next
  • 31. Question No.5 5.__________ are among the most ancient organism,and may have been the starting point for the evolution of photosynthesis. A.Electrons C.Bisphosphate B.Halobacteria D.Stroma