Green plants refer to non-unicellular plants containing chlorophyll, which can be generally understood as green plants.

Green plants can live a photosynthetic autotrophic life in different degrees, but some green plants live a heterotrophic life. People come to the conclusion that plants with a lot of chlorophyll in their bodies are green plants.

Some organisms can carry out photosynthesis, but they are not green plants.

For example, Chlamydomonas contains photosynthetic chloroplasts, but it belongs to microorganisms.

For example, cyanobacteria, which are not green plants, are single-celled organisms with chlorophyll and no chloroplasts.

Cyanobacteria, formerly known as cyanobacteria or blue-green algae, is a kind of large-scale prokaryotic microorganism with a long history of evolution, negative Gram staining, no flagella, no chlorophyll and phycocyanin (but no chloroplast), and capable of oxygen-producing photosynthesis.