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The smallest photosynthetic autotroph
The smallest photosynthetic autotroph on the earth is Prochlorococcus.

Prochlorococcus is an algae belonging to Cladosporium of Cladosporiaceae. Perennial submerged aquatic plants. Algae are filamentous, mostly forming loose spherical or irregular green clumps, with a diameter of 1-30cm, floating at the bottom of the water. There is a large vacuole in the center of the cell with reticular chromophore.

When a cell divides, a ring is produced in the middle of the cell side wall, which grows towards the center and divides the cell into two. Branching occurs at the top of the cell, making it often like dichotomy. Branches appear in some cells near the top of filaments. Spores have flagella of equal length.

Value of Prorochlorococcus: Prorochlorococcus is suitable for indoor water greening and can be placed in a small glass container for viewing. Prochlorococcus is a freshwater algae, which is produced in Ahan Lake, Hokkaido, Japan. It can develop into a sphere with round shape and strong texture without any human intervention.

This peculiar habit has doubled its value. Therefore, in the country of origin, the sale of protogreen algae has become an important income of tourism. Every year from June 5438 to 10, the indigenous people of Ahan Lake hold the "Original Chlorella Festival" to show their respect for it.

Definition of autotroph: also known as producer. Including green plants and many microorganisms, they can use sunlight, carbon dioxide in the air, water and inorganic salts in the soil to produce organic matter through biological processes such as photosynthesis, providing material and energy for the lives of various organisms in the ecosystem.