Question

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 $NADPH.$

d. Stroma lamellae lack $PSII$ as well as $NADP$ reductase.

• A. b and c
• B. a and b
• C. c and d
• D. b and d

Answer 1

The correct option is D b and d

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.

Only $PSI$ is involved in 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 $NADPH.$

Final answer

(A) b and d