Ownclasses

Read the following four statements, A, B,C and D select the right option having both correct statements.
A) Z scheme of light reaction takes place in presence of PS- I only.
B) Only PS-I is functional in cyclic photophosphorylation.
C) Cyclic photophosphorylation results into synthesis of ATP and NADPH2
D) Stroma lamellae lack PS-II as well as NADP.

  • B and D

  • A and B

  • B and C

  • C and D

Answer

A.

B and D

Cyclic photophosphorylation is performed by PS-I only. In this process, an electron expelled by the excited photo centre, ie, P700 is returned to it after passing through a  series of electron carriers. 

PS- I is located on both the non- appressed part of grana thylakoids as well as stroma thylakoids, while PS-II is located in the appressed part of grana thylakoids only, stroma thylakoids lack PS-II.

Cyclic photophosphorylation is performed by PS-I only. In this process, an electron expelled by the excited photo centre, ie, P700 is returned to it after passing through a  series of electron carriers. 

PS- I is located on both the non- appressed part of grana thylakoids as well as stroma thylakoids, while PS-II is located in the appressed part of grana thylakoids only, stroma thylakoids lack PS-II.