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7.1 vocab
| Question | Answer |
|---|---|
| light penetration: | the depth to which light can penetrate into a material |
| phycobilins: | a group a light absorbing pigments that are found in red algae and cyanobacteria; it includes phycoerythin and phycocyanin |
| phycoerythrin: | a red accessory pigment that is frequently found in red algae |
| phycocyanin: | a blue-green accessory pigment that is found in some marine algae |
| light intensity: | a measure of the strength or brightness of light |
| action spectrum: | a graph showing the effect of different wavelengths of light on a process, such as the rate of photosynthesis |
| electromagnetic spectrum: | the range of frequencies and wavelengths of all types of electromagnetic radiation; the electromagnetic spectrum includes visible, ultraviolet and intra-red light, microwaves, X rays, radio waves and gamma waves |
| absorption spectrum: | a graph of the absorbance of different wavelengths of light by a compound such as a photosynthetic pigment |
| R, value: | the distance travelled by a substance on a chromatogram divided by the distance travelled by the solvent front |
| paper chromatography: | a technique used to separate substances by their solubility |
| cyanobacteria: | and photosynthetic bacteria found in marine and fresh water |
| primary pigment: | photosynthetic pigment that is directly involved with photosynthesis |
| chlorophyll (a and b): | green pigments responsible for light capture in photosynthesis in algae and plants |
| accessory pigment: | a pigment that is not essential for photosynthesis but that absorbs light of different wavelengths and passes the energy to chlorophyll a, such as chlorophyll b, xanthophylls and phycobilins |
| carotenoid: | a yellow, orange or red plant pigment used as an accessory pigment in photosynthesis |
| xanthophyll: | a yellow or brown plant pigment used as an accessory pigment in photosynthesis |
| autotrophic nutrition: | the ability of an organism to make its own food by taking inorganic molecules and using energy to create organic molecules |
| protoctists: | a kingdom of organisms that are characterised by the presence of a nucleus and are distinct from plants, animals and fungi |
| diatoms: | group of unicellular algae found in phytoplankton characterised by silica skeletons |
| dinoflagellates: | group of unicellular algae found in phytoplankton characterised by the presence of two flagella |
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