Q. Read the following four statements a, b, c and d and select the right option having both correct statements :
(a) Z scheme of light reaction takes place in presence of PSI only.
(b) Only PSI is functional in cyclic photo-phosphorylation.
(c) Cyclic photo-phosphorylation results into synthesis of ATP and NADPH2.
(d) Stroma lamellae lack PSII as well as NADP reductase.
(i) B and D
(ii) A and B
(iii) B and C
(iv) C and D
Solution :
Correct option : A Statement b Only PSI is functional in cyclic photo-phosphorylation. Elaboration The type of phosphorylation where the electrons are returned to their source i.e., photosystem is termed as cyclic photo-phosphorylation. Statement d Stroma lamellae lack PSII as well as NADP reductase. Elaboration Photosynthesis occurs in chloroplasts which have photosynthetic pigment, chlorophyll. Grana and stroma are the major parts of chloroplast. Granal lamellae have both PSI and PSII while stroma lamellae lack PSII and NADP reductase, the latter used to produce NADPH.