what is the appressed and non appresed part of thylakoids?

Dear Student.
Please find below the solution to the asked query.

The adjacent closed surface between the sacs of  grana  in thylakoids is known as an  appressed  region. Photosystem II is found in  appressed  of  granal  thylakoid.
The region of thylakoid that faces the stroma is known as  non-appressed  region. Photosystem I is found in stromal thylakoids as well as in  non-appressed  region  of   granal  thylakoids. 

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