Autotrophic nutrition is defined as synthesizing organic molecules from inorganic substances. It takes place through photosynthesis.

The conditions that are necessary for autotrophic nutrition (to perform photosynthesis) are water and minerals (obtained from soil), carbon dioxide (obtained from atmosphere) in the presence of chlorophyll (present in the leaves of plant) and sunlight.

The process of autotrophic nutrition (photosynthesis) releases oxygen into the air as its by-product.