An Autotroph is an organism that can self feed The word autotroph comes rom the Greek autos "self" and trophe "nourishing."
Autotrophs are the producers in a food web.
Autotrophs produce their energy from the sun in a chemical process called photosynthesis.
They take Carbon Dioxide plus water and sunlight and produce sugar and oxygen.
Autotrophs form the base of the energy pyramid.
A heterotroph comes from the greek word meaning heteros = "another", "different" and trophe = "nutrition."
Heterotroph get their energy by eating other plants and animals.
Sugar + oxygen to produce carbon dioxide + water and energy in the form of ATP
C6H12O6 + 6 O2 --------> 6 CO2 + 6 H2O + Energy (ATP)
This process is called cellular respiration.
Some Heterotrophs that only eat plants, herbivores) others eat only meat, ( carnivores) others eat plants and animals ( omnivores) while some heterotrophs feed on dead organic remains of other organisms. ( decomposers)