Phototrophs and chemotrophs are two types of nutritional groups found in the environment. Autotrophs produce their own food from simple inorganic substances when an energy source is available. The key difference between the phototrophs and heterotrophs is the energy source that they use. B. Autotrophic Bacteria (Autotrophs): They synthesize their own organic food from inorganic substances (CO 2 and hydrogen donor) Autotrophic bacteria are of two types: (i) photoautotrophic (photosynthetic) which make use of light energy and (ii) chemoautotrophic (chemosynthetic) which … D-photosynthetic autotrophs synthesize organic compounds. Examples for chemosynthetic autotrophs are Nitrosomonas, Beggiatoa. Beggiatoa oxidises H2S to sulphur and water. They perform photosynthesis as well as chemosynthesis. Heterotrophs cannot produce organic compounds from inorganic substances. Autotrophs create nutritional organic substances from simple inorganic sources like carbon dioxide. The energy liberated during this process is used for the synthesis of carbohydrates. Describe the differences between autotrophs and heterotrophs. Main Difference – Phototrophs vs Chemotrophs. Autotrophs are organisms that can produce their own food from the substances available in their surroundings using light (photosynthesis) or chemical energy (chemosynthesis). Heterotrophs eat other organism to get food and energy whereas autotrophs synthesize their own food and energy; Heterotrophs do not store energy whereas autotrophs store energy in the cells in the form of ATP. Chemosynthetic and photosynthetic autotrophs are two types of autotrophs. C-chemosynthetic autotrophs obtain energy from inorganic compounds. Most phototrophs are autotrophs, using the energy from sunlight to produce their food.Chemotrophs oxidize inorganic compounds or organic compounds as their energy source. B-chemosynthetic autotrophs use Co2 as a carbon source. There are two major autotrophic methods of nutrition: photosynthetic and chemosynthetic. but in photosynthesis, light energy is converted into chemical energy and stored in … During this, energy is released and used for its growth. Nitrosomonas oxidizes ammonia into nitrite. The main difference between autotrophic organisms and heterotrophic organisms is that the former produce their own food, while the latter rely on other organisms for food. Phototrophs rely on sunlight to obtain energy while chemotrophs do not rely on sunlight to obtain energy instead rely on chemicals for energy production. The former take advantage of the water and energy of sunlight to break the molecule of carbon dioxide (CO 2 ) from the surrounding air and thus obtain energy. 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