Chapters 5 & 6

Role of Photosynthetic Pigments & Chemistry of Photosynthesis

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1. Light is absorbed, reflected and by a leaf.

2. The photosynthetic pigments from a leaf can be separated by .

3. Chlorophyll absorbs light primarily in the and regions of the spectrum of white light. pigments absorb blue-green light.

4. The quantity of light absorbed by a pigment at different wavelengths of light can be presented as a graph called an spectrum; the rate of photosynthesis that occurs in a plant at different wavelengths of light can be presented as a graph called an .spectrum.

5. Chloroplasts possess internal structures called which contain photosynthetic pigments and are the site of the stage of photosynthesis. The region between grana is called the . It is the site of the stage of photosynthesis.

6. The light-dependent stage of photosynthesis is called . It produces the energy (held in ) and hydrogen needed for the second stage (carbon fixation).

7. The second stage consists of a of reactions which brings about the of carbon dioxide using the ATP and from photolysis to form carbohydrate.

8. Photosynthesis is affected by temperature, light intensity and concentration. Its rate is therefore by whichever one of these factors is in short supply.