the process of photosynthesis.

1. PHOTOSYNTHESIS

2. WHAT IS PHOTOSYNTHESIS?
PHOTO MEANS LIGHT AND SYNTHESIS
MEANS TO PUT TOGETHER. BUT CAN
WE SAY PHOTOSYNTHESIS IS THE
PROCESS OF PUTTING TOGETHER
COMPONENTS TO MAKE LIGHT? WELL,
I DON’T THINK SO. NOW LETS
EXPLORE THIS CONCEPT TOGETHER
AND UNDERSTAND ITS MEANING.

3. PHOTOSYNTHESIS IS …
the process in which green
plants, in the presence of
sunlight, makes sugars and
starches from carbon dioxide
and water.

4. PHOTOSYNTHESIS IS…

5. How does it happen?
 The leaves of a plant take in sunlight which is one of the
requirements needed before photosynthesis can take place.
 Sunlight is then used to make sugar which comes in the form of
food manufactured by the plants.
 The sunlight is absorbed into the leaves.
 The chlorophyll inside the plant cell is where sunlight is stored.
 After absorbing the sunlight the plant also takes in Carbon
Dioxide from the air.
 After this the plant is ready to start creating the products of
Photosynthesis.
 The plant makes oxygen and sugar from the sunlight and Carbon
Dioxide that has been taken in.

6. CHEMICAL EQUATION : PHOTOSYNTHESIS
 CHEMICAL EQUATION
 6CO2+6H2O=> C6H1206+6O2
 SUNLIGHT + CARBONDIOXIDE + WATER =>
GLUCOSE + OXYGEN
TAKE NOTE THAT..
 In the photosynthesis equation, it shows that carbon
dioxide and water is combined with the presence of
sunlight to produce glucose and oxygen

7. PURPOSE OF PHOTOSYNTHESIS
 To make food for plants.
 All living organisms are dependant on the organic
molecules synthesised by plants from the process of
photosynthesis.
 Photosynthesis provides us with most of the oxygen
hence we are able to breath.
 We therefore are able to exhale the carbon dioxide
needed by the plants.
 Plants are also crucial to human life because we rely
on them as a source of food for ourselves and for the
animals that we eat.

8. STAGES OF PHOTOSYNTHESIS
Photosynthesis happens in TWO
stages.
 The first stage is light reaction which
occurs only in the presence of light.
 The next stage is dark reaction where light
is not needed but it can also occur in the
presence of light.

10. FUNCTION OF EACH STAGE
Light Reactions
Pigments & proteins in thylakoids
makes ATP and NADPH
“Dark” Reactions
Enzymes in stroma decreases CO2 to
carbohydrates by using ATP &
NADPH

11. LIGHT PHASE
 The light reaction takes
place in the membrane of
grana.
 During the light reaction,
chlorophyll in the thylakoid
captures light energy.
 Light energy, to split the
water molecules into
hydrogen ions (H+) and
hydroxyl ions (OH-). The
reaction is known as
photolysis of water.
 The hydrogen ions then
combine with the electrons
released by chlorophyll to
from hydrogen atom
 The energy released from
the excited electrons is
used to from energy-rice
molecules of ATP.
 The ATP molecules and
hydrogen atoms then move
to the stroma to provide
energy and reducing power.

12. DARK PHASE
 During the dark reaction, the hydrogen atoms are
used to fix carbon dioxide in a series of reactions
catalysed by photosynthetic enzymes.
 The overall reaction results in the decrease of
carbon dioxide into glucose.
 [CH2O] is the basic unit of glucose.
 Six units of [CH2O] combine to from one molecule of
glucose.
 The glucose monomers then undergo condensation
to from starch which is temporarily stored as starch
granules in the chloroplasts.

13. DARK AND LIGHT PHASE

14. COMPARING LIGHT AND DARK PHASE

16. The END!!!

17. REFERENCE
Acetor H. 2011. the importance of photosynthesis in the ecosystem. Available on SlideShare @
https://www.slideshare.net/AcetorHo/the-importance-of-photosynthesis-in-the-ecosystem
.
c2cha. 2011. photosynthesis: light energy to chemical energy. Available on SlideShare
https://www.slideshare.net/c2cha/phs-08-09
Donn w. 2015. Basics of the process of photosynthesis. Available on SlideShare @
https://www.slideshare.net/doni99/basics-of-the-process-photosynthesis
Lewis. C. 2015. Bad photosynthesis. Available on SlideShare @
https://www.slideshare.net/CaitlinLewis/badphotosynthesis
Pattnaik. C. 2015. photosynthesis basics study for class 10th. Available on SlideShare @
https://www.slideshare.net/100006973117361/photosynthesis-basics-study-for-class-10th
Shalaby A.B. 2016. photosynthesis. Available on SlideShare @
https://www.slideshare.net/Abu_Bakr_Shalaby/photosynthesis-58248977
Smann C.J. 2017. chapter 6 nutrition . Available on SlideShare @
https://www.slideshare.net/cjsmann/61184498-chapter6nutrition