1. The Working Cell: Energy from Sunlight
Chapter 8
The Working Cell: Energy from Sunlight

2. Autotrophs
Organisms that can make their own food by photosynthesis

3. Autotrophs
can turn inorganic raw materials into ORGANIC compounds

4. Why are heterotrophs dependent on autotrophs?
For FOOD (glucose) and OXYGEN

5. Plant Cells vs. Animal Cells

6. Animal Tissue Examples

7. Animal Organs
Name 6 organs…

8. Name 3 animal organ systems…..

9. Dermal – Protection (outer covering)
Plant Tissues
Dermal – Protection (outer covering)
Vascular – Transports Water and Nutrients
Ground – Photosynthesis, storage and support

11. Plant Organs
Roots
Stems
Leaves
Flowers

12. Roots absorb water & soil nutrients

13. Stems display leaves & transport food and water

14. Leaves are the site of photosynthesis

15. Flowers are reproductive organs

16. A. Ground tissue
B. Cuticle
C. Chloroplasts
D. Dermal Tissue
E. Vascular Tissue
F. Stomate
G. Guard Cell
Leaf Cross Section

17. 8.1
Photosynthesis
uses light energy to
make food.

18. Photo =
Synthesis =
Light
Building Process

19. Photosynthesis

20. Chloroplast Organelle where photosynthesis takes place
Found in the mesophyll layer of leaf (ground tissue)

21. Leaves Which part of a plant would contain the most number of
chloroplasts?
Leaves

22. Chlorophyll
Pigment that gives the chloroplast its green color; it absorbs sunlight!

23. How plants breathe…
GUARD CELLS (2) form an opening in the surface of the leaf (most often the lower layer).
Each leaf on a plant may have 100’s of these!

24. Opening Formed by 2 guard cells, thru which gasses are exchanged.
Stomate (pl, stomata)
Opening Formed by 2 guard cells, thru which gasses are exchanged.
animation

25. Stomata
When stomates open, the plant loses water by transpiration

26. chloroplasts
guard cells
stomata
nucleus

27. Stomata
Stomata
Guard Cell
Guard Cell

28. Stomata
Guard
cells
transpiration://croptechnology.unl.edu/animationOut.cgi?anim_name=transpiration.swf:

29. Overview of Photosynthesis:
Chloroplasts take in carbon dioxide and water to make glucose & oxygen.

30. Fill in:
reactants on the left
products on the right

31. C6H12O6 CO2 H2O O2 Light Energy photosynthesis Light Energy Reactants
Products
Light
Energy
CO2
C6H12O6
H2O O2

32. Overall chemical equation for photosyntheis:

33. + +
6CO2+ 6H2OC6H12O6 +6O2

34. 8.2
Light Energy

35. Electromagnetic Spectrum
The range of types of electromagnetic energy.
Radio waves Gamma rays

36. Gamma

37. What is light?
electromagnetic
ENERGY!

38. What is the main source of light energy?

39. Visible Light
The electromagnetic waves that we can see

40. The Light Spectrum (R O Y G B I V ) Red Orange Yellow Green Blue
Indigo
Violet
(R O Y G B I V )

41. The light spectrum…
R O Y G B I V
It’s the rainbow!

42. White light is all the colors
Combined!

43. To see an object, light energy must enter our eyes, therefore, the light must be…???

44. Objects appear as different colors because…
They reflect different wavelengths (examples?)

45. Objects ABSORB the colors that they do NOT reflect….
So what colors of light do green plants absorb the most?

46. 3 things can happen when light strikes an object:
5. Pigments & Color
3 things can happen when light strikes an object:

47. 1. It can be REFLECTED

48. 2. or TRANSMITTED

49. 3. or ABSORBED

50. Data Table of Light Absorbance
Use the data table to make a bar graph of the absorption of light by plants.
Data Table of Light Absorbance
Color
Absorbed (%)
Red 80
Orange 15
Yellow 10
Green 5
blue 90
R O Y G B

51. 6. Identifying Chloroplast Pigments
Paper chromatography separation of pigments
Class activity….

52. Separate chemicals in a black marker
Separate pigments in a leaf