An organism capable of producing complex organic compounds from simple inorganic molecules through the process of photosynthesis (using light energy) or through chemosynthesis (using chemical energy).
Another name for an autotroph.
An organism that harnesses light energy to drive the synthesis of organic compounds from carbon dioxide.
An organism that obtains organic food molecules by eating other organisms or substances derived from them.
Another name for a heterotroph.
A particle of electromagnetic radiation with no mass that carries a quantum of energy
The distance between crests of waves, such as those of the electromagnetic spectrum.
Electromagnetic radiation that can be seen with the unaided eye.
What is the unit of measurement of wavelengths of light?
_____ wavelengths have the most energy.
_____ wavelengths have the least energy.
When light meets matter, it can be reflected, absorbed, or _____.
Leaves appear green because the pigment _____ reflects and transmits green light.
A profile of the relative performance of the different wavelengths in photosynthesis.
What autotroph did Engelmann use in his action spectrum experiment in 1883?
What gas did Engelmann measure as an indicator of photosynthetic activity?
What organism did Engelmann use as a measure of the amount of the products of photosynthesis?
What device is used to measure a pigment's ability to absorb various wavelengths?
In a spectrophotometer, if transmittance is low, than absorption is _____.
In a spectrophotometer, if transmittance is high, than absorption is _____.
A graph plotting a pigment's light absorption versus wavelength.
What two wavelengths of light work best for photosynthesis?
Violet-blue and red
When a pigment absorbs light, it goes from a ground state to a(n) _____ state.
If illuminated with UV light, an isolated solution of chlorophyll will _____, giving off red light and heat.
Chlorophyll is found in the _____ of the mesophyll cells of leaves.
In addition to light energy, what two other reactants are needed for photosynthesis?
Carbon dioxide and water
The process whereby small amounts of dissolved substances are separated by running a solvent along a material such as absorbent paper.
What two organic solvents did we use in the paper chromatography experiment?
Petroleum ether and acetone
The leading edge of the advancing liquid during chromatography.
During chromatography, the pigments move at different rates, depending on their differing _____ in the solvent and their attraction to the filter paper.
Which pigment is the most polar?
Chromatography paper (cellulose) is a _____ substance.
The solvent used in chromatography is a _____ substance.
Which pigment will move the slowest during paper chromatography - the most polar or least polar?
What does Rf stand for in chromatography?
In Activity 1, what liquid did you boil your leaves that were covered with the filters?
In Activities 1 and 2, what chemical did we test for to determine the presence of photosynthesis?
In Activity 1, which color filter allowed the greatest photosynthetic activity?