Plants have evolved a specialised organelle responsible for photosynthesis – the chloroplast

The chloroplast contains membrane sacs (called thylakoids) arranged into stacks (called grana)

  • These membrane sacs contain chlorophyll and are the site of the light dependent reactions

The surrounding fluid matrix is called the stroma and contains carbon fixating enzymes

  • This is the site of the light independent reactions

The Chloroplast

chloroplast structure