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Organisms that can capture energy from sunlight or chemicals and use that energy to produce food are called autotrophs, or primary producers. The process in which autotrophs capture light energy and use it to convert carbon dioxide and water into oxygen and sugars is called photosynthesis.rganisms that can capture energy from sunlight or chemicals and use that energy to produce food are called autotrophs, or primary producers. The process in which autotrophs capture light energy and use it to convert carbon dioxide and water into oxygen and sugars is called photosynthesis.
Food Chains & Food Webs. 1  Plants are called producers because they are able to use light energy from the Sun to produce food (sugar) from carbon dioxide and water. 2  The process by which plants make food is called photosynthesis.3  Animals cannot make their own food so they must eat plants and/or other animals.ood Chains & Food Webs. 1  Plants are called producers because they are able to use light energy from the Sun to produce food (sugar) from carbon dioxide and water. 2  The process by which plants make food is called photosynthesis.