1. Getting Energy and Matter into Biological Systems+
Write a statement that explains what is taking place in this picture

2. Review We, living organisms, need ________ in order to survive.
Molecules like _________, ________, and _________ found in food provide us this.
Molecules are made of ____________ such as Carbon, Hydrogen, Oxygen, etc.
These ___________ are what make up matter.
So how do we get matter found in food in the first place? Who/what gets the credit?

3. Photosynthesis! The process by which plants, some protists, and some bacteria use energy transferred from the sun to...
…synthesize LARGE, energy rich molecules from small ones. What do plants make?
 CO2 

4. Things that may affect the rate of photosynthesis:
Intensity of light
Amount of CO2
Water availability?
What else?
Color of light?
Toxins?
Soil nutrients?

5. A Plant Cell

6. Where does PS happen? All plants are made up of plant cells
Most plant cells contain chloroplasts, which make them appear green
Inside chloroplasts, there are structures called thylakoids
In the thylakoid membranes, chlorophyll is stored
Chlorophyll is a pigment that absorbs the sun’s energy

8. Light energy from the sun hits the chlorophyll molecules
Much of the light energy is absorbed but one wavelength of light is reflected off, not absorbed.
This is the “color” of light that you see.

10. 3 major events, but 2 “phases”
Absorption of light energy
2. Conversion of light energy into chemical energy  1st PHASE
outcome:
3. Storage of chemical energy in the form of carbs a.k.a. glucose 2nd PHASE

11. How do you “fix” Carbon?
Bottom of a leaf
Cross-section of a leaf

13. Carbon Fixation is the process that converts atmospheric Carbon Dioxide into carbohydrate
molecules (glucose, etc.)

14. Why does photosynthesis happen?
Autotrophs use PS to get and store energy (as ___________)
Heterotrophs eat autotrophs and use these carbohydrates as energy sources

15. The Big Picture…

16. Reactions
Photosynthesis
Cell Respiration

17. Connect PS and CR reactions to Endo and Exothermic reactions…

18. Video Clip

19. Homework due Wednesday
Read Essay in textbook, Getting Light Energy into Biological Systems, p.367
Complete the first half of Photosynthesis Review WS