1. ATP, Chloroplasts, and Leaves

2. Chemical Energy and ATP
Where in chemical compounds (FOOD) is the energy located?
Energy in a molecule is in the chemical bonds formed between the atoms of that molecule.
When a high-energy bond is broken and lower energy bonds are made, energy is released.

3. Chemical Energy and ATP
Adenosine Triphosphate
an important chemical in life's never ending need for energy
acts as a carrier of energy

4. Chemical Energy and ATP
extremely useful as the basic energy source of all cells
the third phosphate on an ATP molecule can readily be broken (releasing energy) and reformed (requires energy)
cells possess only small amounts of ATP

5. Pigment material that changes the color of reflected light
plants gather the sun’s energy with light absorbing pigments

6. Pigment
the primary plant pigment is chlorophyll

7. Chlorophyll
absorbs light energy very well in the blue, violet and red wavelengths of the spectrum
So why are plants green?
chlorophyll reflects green light

8. Carotenoids secondary pigment that produces fall leaf colors
also produces color of many fruits and vegetables
absorb different wavelengths of light

9. How do pigments absorb light energy?

10. by kicking an electron into a higher energy level

11. as these electrons are returned to their normal state the energy released is used to make ATP and a compound called NADPH
more on this when we discuss Photosynthesis

12. Chloroplast oval shaped organelle
composed of an inner and an outer membrane

13. Chloroplast
the inner membranes, thylakoids, are arranged in stack like layers called grana
the fluid in the chloroplast is called stroma
stroma
thylakoid
granum

14. thylakoids

15. Leaves organs where photosynthesis takes place
provide a place for gas exchange

16. Stomata pores on the surface of a leaf
allow gases to enter and leave the plant
surrounded by two guard cells

17. Guard Cells
specialized cells that can open and close to control gas exchange
typically closed in time of drought
prevents water from leaving the plant