What is the difference between autotrophic and heterotrophic nutrition?

Autotrophic and heterotrophic nutrition are two fundamental modes of nutrition that differ in how organisms obtain and produce their food.

Autotrophic nutrition is a mode of nutrition in which organisms prepare their own food from simple inorganic substances like carbon dioxide and water using energy from sunlight or chemical reactions. This process is commonly seen in green plants, algae, and some bacteria.

Heterotrophic nutrition is a mode of nutrition in which organisms depend on other organisms for their food. They consume complex organic substances produced by autotrophs or other heterotrophs.

Key differences:

• Food source:
  Autotrophs produce their own food; heterotrophs obtain food from other organisms.

• Energy source:
  Autotrophs use sunlight (photosynthesis) or chemical energy (chemosynthesis); heterotrophs derive energy from consumed food.

• Examples:
  Autotrophs: green plants, algae, cyanobacteria
  Heterotrophs: humans, animals, fungi

• Role in ecosystem:
  Autotrophs are producers; heterotrophs are consumers.

• Dependency:
  Autotrophs are independent for food; heterotrophs are directly or indirectly dependent on autotrophs.

In simple terms: Autotrophs make their own food, while heterotrophs rely on others for nutrition.