Question

PS- I occurs in

• A. Appressed parts of grana thylakoids.
• B. Appressed and non-appressed parts of grana thylakoids.
• C. Stroma
• D. Stroma thylakoids and non-appressed parts of grana thylakoids.

Answer 1

Answer: (D)

Stroma thylakoids and non-appressed parts of grana thylakoids.

Chloroplasts are eukaryotic cell organelles. They are covered by the double membrane and also have an internal membrane system comprised of thylakoid membranes. The thylakoid membranes are of two types. The membranes which make grana are called granal lamellae. The other thylakoid membranes are called stromal membranes . The non-appressed membranes (stromal membranes and edges of granal membranes) are in direct contact with the stroma. The PS- I is abundant in non-appressed membrane whereas PS- II is abundant in granal membranes.