What are Pyrenoids?

Pyrenoids:

1. Pyrenoids are subcellular micro-compartments present in many algae's chloroplasts and in hornworts, a solitary terrestrial plant species.
2. Pyrenoids are involved in the operation of a carbon-concentration process (CCM).
3. They operate as carbon dioxide (CO₂) fixation centres by creating and maintaining a CO₂-rich environment surrounding the photosynthetic enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO).