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 PS I only.(B) Only PS I is functional in cyclic photophosphorylation.(C) Cyclic photophosphorylation results into synthesis of ATP and NADPH$$_{2}$$.(D) Stroma lamellae lack PS II as well as NADP.

A
(B) and (D)
B
(A) and (B)
C
(B) and (C)
D
(C) and (D)

Solution

## The correct option is A (B) and (D)Z scheme of light reaction is non cyclic fow of electron from PSII through quinone, cyt $$b_6$$ f complex and plastocyanin to NADPH via PSI; it does not return to PSII. NADP reductase enzyme is located on stromal side of PSI; Z scheme includes both PSI and PSII. Absence of PS-II leads to non cyclic photophosphorylation in which electrons are passed from PS-I, via electron transfer chain, to back to PS-I with formation of ATP. Cyclic photophosphorylation does not pass electrons to NADP; rather electrons are passed back to PSI. Result is formation of ATP but no NADPH2. Stroma lamellae have PSI only but lack PSII and NADP reductse. Statements B an D are correct. Correct answer is A.Biology

Suggest Corrections

0

Similar questions
View More

People also searched for
View More