Absorption spectrum
Definition
An absorption spectrum is a graph showing the wavelengths of light absorbed by a pigment. It indicates specific wavelengths that are absorbed by molecules, such as chlorophyll, during photosynthesis.
5 Must Know Facts For Your Next Test
- Chlorophyll a and b have distinct absorption peaks in the blue and red regions of the spectrum.
- The absorption spectrum is crucial for understanding which wavelengths of light drive photosynthesis most effectively.
- Accessory pigments like carotenoids expand the range of light wavelengths that can be used in photosynthesis.
- The absorption spectrum can be measured using a spectrophotometer.
- The green color of leaves results from chlorophyll reflecting green light, which is not absorbed.
Review Questions
- What are the primary regions of light absorbed by chlorophyll a and b?
- Why are accessory pigments important in photosynthesis?
- How does an absorption spectrum help in understanding the efficiency of photosynthesis?
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Related terms
Chlorophyll: A green pigment found in plants that absorbs light to provide energy for photosynthesis.
Spectrophotometer: An instrument used to measure the intensity of light at different wavelengths.
Carotenoids: Accessory pigments in plants that absorb blue and green light, expanding the range of usable light.
