Carbon and energy requirements of autotrophic organisms are fulfilled

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Carbon and energy requirements of autotrophic organisms are fulfilled by:

Photosynthesis
Gluconeogenesis
Glycogenesis
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This question was previously asked in
UPSC NDA-2 – 2015
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Autotrophic organisms, such as plants and some bacteria, synthesize their own organic compounds for energy and carbon requirements. The primary process by which most autotrophs achieve this is photosynthesis, using light energy to convert carbon dioxide and water into glucose (a carbohydrate) and oxygen.
Autotrophs obtain their carbon and energy through processes like photosynthesis or chemosynthesis.
Gluconeogenesis and Glycogenesis are metabolic pathways primarily occurring in heterotrophic organisms (like animals) or for storage/synthesis within the organism, not the means by which autotrophs *initially* acquire carbon and energy from external inorganic sources. External sources are what heterotrophs consume.

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