Photosynthesis and Respiration

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

3.  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

4.  Plants need light energy, CO2, and H2O
 Where does all of this happen?
 Photosynthesis takes place in the
chloroplasts of a leaf
› It uses chlorophyll: the green
pigment in plants
 See Picture on next slide

7.  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.

8.  What is the difference between a
molecule and an atom?
› Atom: smallest unit which something can
exist (carbon, nitrogen, hydrogen, etc.)
› Molecule: made up of two or more atoms
(H2O, CO2, etc)

9.  What does sunlight do for the plant?
 Sunlight provides the energy needed by
chlorophyll to change molecules of
carbon dioxide and water into glucose
› Is something missing?
 Oxygen is also released in this reaction
(O2)

10.  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.

12.  There are two types of respiration:
and

13.  The process of cellular respiration
is a chemical reaction.
 It is the most important chemical
reaction in our bodies

14.  Cellular respiration is a process, just
like photosynthesis.
 Where does this process take place
though? Any guesses?
› Cellular respiration takes place in the
mitochondria!
› See Image on next slide!

16.  Takes place in all living things (even
plants!)
 The mitochondria takes in nutrients
(glucose and oxygen), break them
down, and create energy for the cell.

17. Glucose + Oxygen Carbon Dioxide + Water
Or another way of writing the equation is:
C6H12O6 + 6O2 6CO2 +
6H2O

18.  It is the basic cycle on Earth.

19. 

20. Notice any now?

22.  http://www.pbslearningmedia.org/resource/