Question

The diagram given below shows ATP synthesis through chemiosmosis.

Which option shows the correct labelling of $A,B,C$ and $D$ in the diagram ?

• A. A - $F_1$ , B - Thylakoid membrane, C - Photosystem (I), D - Photosystem (II)
• B. $A-F_0$, B - Thylakoid membrane, C - Photosystem (I), D - Photosystem (II)
• C. A-$F_1$ , B - Thylakoid membrane, C - Photosystem (II), D - Photosystem (I)
• D. A - $F_0$, B - Thylakoid membrane, C - Photosystem (II), D - Photosystem (I)

Answer 1

Answer: (D)

In the given diagram of ATP synthesis through the chemiosmosis, the correct labelling of the $A,B,C$ and $D$ are respectively $F_0$, thylakoid membrane, photosystem II and photosystem I. The chemiosmotic theory (Mitchell 1961) explains how ATP is generated in the chloroplast. ATP synthesis in chloroplasts (photophosphorylation) proceeds according to a mechanism that is basically similar to that in mitochondria.