Question

In the chloroplast, the stroma lamellae lack the ...
1. PS I & NADP reductase
2. PS II & PS I
3. NADP reductase enzyme & PS I
4. NADP reductase & PS II

Answer 1

Electrons are not passed to NADP reductase; no NADPH2 is formed. Stroma lamellae lack PS II as well as NADP reductase enzyme while grana lamellae have both PS I and PS II.

Top answer

Z scheme of light reaction is noncyclic flow of an electron from PSII through quinone, cyt b6 f complex and plastocyanin to NADPH via PSI;it includes ...

Answer 2

Statement :

(A) Z scheme of light reaction takes place in presence of PS-I only.

(B) Only PS-I is functional in cyclic photophosphorylaiton.

(C) Cyclic photophosphorylation results into synthesis of ATP and NADPH  

 

.

(D) Stroma lamellae lack PS-II as well as NADP.

ANSWER

Z scheme of light reaction is noncyclic flow of an electron from PSII through quinone, cyt b  

 

 f complex and plastocyanin to NADPH via PSI;it includes both PSI and PSII. In cyclic photophosphorylation, electrons are passed from P700 of PS-I via electron transfer chain to back to P700 with the formation of ATP.  It does not include PS II. Electrons are not passed to NADP reductase; no NADPH  

 

 is formed. Stroma lamellae lack PS II as well as NADP reductase enzyme while grana lamellae have both PS I and PS II. Thus, the correct answer is option B.