summary of 8.2

Concept 8.2 - The light reactions convert light energy to chemical energy.





Key Terms:

wavelength- between adjacent waves

electromagnetic spectrum- range of types of electromagnetic energy from gamma waves to radio waves

pigment- chemical compound that determines a substance's color

paper chromatography- laboratory technique used to observe the different pigments in a material

photosystem- cluster of chlorophyll and other molecules in a thylakoid



Summary:

* we can know the wavelength by the electromagnetic spectrum

- in this chart, we can also know the visible lights in the graph

* when the light shine at the pigment, it can be absorbed, transmitted, or reflected. (leaves bounce back (reflect) those lights so they look green)

* thylakoid membrane absorb light energy and one of the pigment gains electron energy

*The light reactions convert light energy to the chemical energy of ATP and NADPH.

Concept Check:

1. Explain why a leaf appears green.


They reflect the outside their organelles so they appears green.




2. Describe what happens when a molecule of chlorophyll a absorbs light.
One of the pigments change it into electron energys




3. Besides oxygen, what two molecules are produced by the light reactions?
Chemical energy of ATP and NADPH.




4. Where in the chloroplast do the light reactions take place?
In the thylakoid membrane