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autotroph
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).
producer
Another name for an autotroph.
photoautotroph
An organism that harnesses light energy to drive the synthesis of organic compounds
from carbon dioxide.
heterotroph
An organism that obtains organic food molecules by eating other organisms or
substances derived from them.
consumer
Another name for a heterotroph.
photon
A particle of electromagnetic radiation with no mass that carries a quantum of energy
wavelength
The distance between crests of waves, such as those of the electromagnetic spectrum.
visible light
Electromagnetic radiation that can be seen with the unaided eye.
What is the unit of measurement of wavelengths of light?
Nanometers
_____ wavelengths have the most energy.
Shorter
_____ wavelengths have the least energy.
Longer
When light meets matter, it can be reflected, absorbed, or _____.
Transmitted
Leaves appear green because the pigment _____ reflects and transmits green
light.
chlorophyll
action spectrum
A profile of the relative performance of the different wavelengths in photosynthesis.
What autotroph did Engelmann use in his action spectrum experiment in 1883?
Filamentous algae
What gas did Engelmann measure as an indicator of photosynthetic activity?
Oxygen
What organism did Engelmann use as a measure of the amount of the products of
photosynthesis?
Aerobic bacteria
What device is used to measure a pigment's ability to absorb various
wavelengths?