What uses energy from the environment to make food?

Expert Answers

An illustration of the letter 'A' in a speech bubbles

Organisms that make their own food are called producers (because they PRODUCE, or make, their own food). Other names for producers are autotrophs (auto = self, so they feed themselves). Producers can be plants or algae. These organisms are made of plant cells. One of the extra organelles that is found in plant cells but not animal cells is the chloroplast. A chloroplast contains a green pigment called chlorophyll. The chlorophyll captures sunlight energy in order to convert carbon dioxide and water into oxygen and glucose. Glucose is a form of sugar that producers use as their energy source. This process that occurs in the chloroplast is called photosynthesis. The hyperlink shows the chemical formula for photosynthesis. 

Chemoautotrophs undergo a similar process. However, they do not use the sun as their energy source. Instead, they obtain energy by the oxidation of organic or inorganic electron donors (H2S, Sulfur, ammonia, etc) in their environments. An example of a chemoautotroph is cyanobacteria. 

See eNotes Ad-Free

Start your 48-hour free trial to get access to more than 30,000 additional guides and more than 350,000 Homework Help questions answered by our experts.

Get 48 Hours Free Access
Approved by eNotes Editorial Team