8.2

Vocab: 8.2
Wavelengh:
The distance betwenn 2 adjacent waves
Electromagnetic spectrum:
The graph that shows the range of type of electomagnetic energy.
pigment:
Chemical compounds that a substance's colour is due to.
Paper chromatography:
Laboratory technique that can be used to observe the different pigments in a keaf.
Photosystems:
Clusters that chlorophyll and ofthe molecules are arranged in.

Summarize: 8.2
The light reactions convert light energy to chemical energy. Wavelenghs are the distance between 2 adjacent waves and if you put them in a order, then you'll get a electromagnetic spectrum. Pigments make the colour of a substance, and can be seen with the lab experiment known as the paper chromatography. When sunlight comes, clusters of pigments form photosystems to receive the energy, and later used to make ATP and NADPH.

Concept Check: 8.2
1. Explain why a leaf appear green.
Because there is pigments in them.
2. Describe waht happens when a molecule of chlorophylla a absorbs light.
It traps the excited electron,
3.Besides oxygen, what two molecules are produced byt he light reaction.
ATP and NADPH.
4. Where in the chloroplast do the light reaction take place?
Photosystems.