Organisms that make their own organic compounds from inorganic substances are called

Organisms that make their own organic compounds from inorganic substances are called autotrophs.

Here are the steps that explain this process:

1. Autotrophs, such as plants, algae, and some bacteria, are capable of photosynthesis. This is the process by which they convert light energy, usually from the sun, into chemical energy in the form of glucose (a type of sugar).

2. During photosynthesis, these organisms take in carbon dioxide from the air and water from the soil.

3. In the presence of sunlight, these substances undergo a chemical reaction in the chloroplasts (the part of the cell responsible for photosynthesis) of the organism.

4. This reaction produces glucose, which is an organic compound, and oxygen.

5. The glucose is used by the organism for energy and growth, while the oxygen is released back into the atmosphere.

6. Some autotrophs, like certain types of bacteria, use a process called chemosynthesis instead of photosynthesis. In chemosynthesis, the energy for making organic compounds comes from chemical reactions, often involving substances like hydrogen sulfide or methane.

So, in summary, autotrophs are organisms that can make their own organic compounds from inorganic substances, using either light energy (photosynthesis) or chemical energy (chemosynthesis).