1. Photosynthesis and Respiration
NOMUSA
KHUZWAYO

2. Photosynthesis and Respiration.

3. THE SUN: MAIN SOURCE OF
ENERGY FOR LIFE ON EARTH

5. Photosynthesis
The process of photosynthesis is a
chemical reaction.
It is the most important chemical
reaction on our planet.

6. What is the Process?
 The process of changing light energy (from the sun or other light source)
to chemical energy
 This energy is stored as sugar (a carbohydrate)
 Occurs in plants and some algae
 Plants need light energy,
CO2, and H2O
 Photosynthesis takes place
in the chloroplasts, using
chlorophyll, the green
pigment in plants

7. What Happens in this
Chemical Reaction?

8. How Do Scientists Write
this Chemical Reaction?
 What does this mean?
 Six molecules of carbon dioxide react with six molecules
of water to form 1 molecule of glucose and six
molecules of oxygen.

9. THE BASICS OF
PHOTOSYNTHESIS
 Autotrophs generate their own organic
matter through photosynthesis
 Sunlight energy is transformed to
energy stored in the form of chemical
bonds
(a) Mosses, ferns, and
flowering plants
b) Kelp
(c) Euglena
(d) Cyanobacteria

10. Light Energy Harvested by
Plants & Other Photosynthetic
Autotrophs

12. How do autotrophs make their own
food?
 Autotrophic organisms possess cells that contain chlorophyll.
 Chlorophyll is a green pigment located in the chloroplast and is
responsible for giving green plants their color
 Chlorophyll absorbs light energy from the sun.

13. What happens next?
 Autotrophs take carbon
dioxide into their cells
through diffusion and
water into their cells
through osmosis.
 Then a series of
reactions that take
place that result in the
formation of oxygen and
glucose

14. THE FOOD WEB IN HOW THE
FLOW OF HEAT FLOW FROM ONE
ORGANISM TO ANOTHER.

15. WHWHY ARY ARE PE PLANLANTS GTS GREREEN?EN?

16. WHYWHY AREARE PLAPLANTSNTS GREGREEN?EN?
The thylakoid
membrane of the
chloroplast is
impregnated with
photosynthetic
pigments (i.e.,
chlorophylls,
carotenoids).
Plant Cells
have Green
Chloroplasts

17. The feathers of male
cardinals are loaded with
carotenoid pigments.
These pigments absorb
some wavelengths of light
and reflect others. Sunlight minusSunlight minus
absorbedabsorbed
wavelengths orwavelengths or
colors equals thecolors equals the
apparent color ofapparent color of
an object.an object.

18.  Plants capture light energy and use that energy to make sugar (which can
be changed to starch, a carbohydrate, also)
 Sunlight provides the energy needed by chlorophyll to change molecules
of carbon dioxide and water into glucose
 Oxygen is also released in this reaction
Formation of Starch.

19. Why Is This So
Important?
 We cannot make our own food (glucose, energy), we must get our food from
plants.
 Plants are the first step in the food chain.
 The oxygen released during photosynthesis is necessary for all living things.

20. Photosynthesis and
Respiration are Related
 It is the basic cycle on Earth.

21. What colours are being absorbed and
what colours are being reflected.

22. Notice Any Similarities?


23. Any Similarities with
These?


24. 
Notice any now?

25. THE COLOR OF LIGHT
SEEN IS THE COLOR
NOT ABSORBED
Chloroplasts
absorb light
energy and
convert it to
chemical energy
Reflected
lightLight
Transmitted
light

26. Respiration
 There are two types of respiration:
and

27. What is Cellular
Respiration?
The process of cellular respiration is
a chemical reaction.
 It is the most important chemical
reaction in our bodies

28. What is the Process?
 Cellular respiration is a process, like photosynthesis.
 Cellular respiration takes place in the mitochondria.
 The mitochondria take in nutrients (glucose and
oxygen), break them down, and create energy for the
cell.
 This process of creating cell energy is known as cellular
respiration.
 Takes place in all living things (even plants!)

29. Let’s Write the Chemical
Equation
Glucose + Oxygen Carbon Dioxide + Water
Or another way of writing the equation is:
C6H12O6 + 6O2 6CO2 + 6H2O

30. REFERENCE LIST
o Clonardo,N.(2012),Photosynthesis and Respiration,
http://www.slideshare.net/clonardo/photosynthesisandrespirationpvms1
o Pointer,K.(2011),Photosynthesis and primary metabolism,
http://www.slideshare.net/coachpointer/photosynthesis-7346091
o Tamara,D.(2010),Advances in Photosynthesis and Respiration,
http://www.slideshare.net/tamarad423/biology-83
o Walker,H.(2013),Modelling Photosynthesis and its control,
http://www.slideshare.net/walkerhk/photosynthesis-
100503122339phpapp01