Statement A: During photosynthesis, oxygen is released in grana thylakoids of chloroplasts of higher plants.Statement B: Grana thylakoids have water splitting complex associated with Photosystem I

In chloroplasts, grana thylakoids have PSI and PS II and PSII is associated with water splitting complex. Stroma thylakoids have only PSI and oxygen is not released in stroma thylakoids as water splitting complex is not associated with PS I.