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
5.
6.
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.
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!
15.
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