ETC

Q. Which of the following is correct regarding non-cyclic photophosphorylation?

1. The excited electron starts its journey from PS-II and goes on to PS-I and does not return to PS-II
2. It involves both PS-I and PS-II
3. ATP and NADPH are synthesised during non-cyclic photophosphorylation
4. All of the above

Q. Z-scheme in thylakoid membrane is concerned with

1. reduction of $NAD+$
2. reduction of $C{O}_2$
3. all of these
4. electron transfer

Q. Z-scheme shows the non-cyclic electron flow of light reaction in oxygenic photosynthetic organisms. According to the Z-scheme, choose the correct statement(s) :
I. $P_{680}^{+}$ is the $P_{680}$ molecule that lost its electron. It has the maximum reduction potential.
II. $P_{680}^{\ast }$ is the excited $P_{680}$ molecule after absorption of the light energy. It has the lowest reduction potential
III. Final electron acceptor of PS I is Fe-S centre
IV. Flow of high energy electron in the electron transport chain creates a pH difference between the chloroplast stroma and thylakoid lumen

1. Only I
2. I and IV
3. III and IV
4. II, III and IV

Q.

Where does the cyclic electron flow occur?

Q. Assertion : In case of cyclic photophosphorylation, there is no production of NADPH and oxygen.

Reason : As the electron flows cyclically and NADPH is present in sufficient amount in the cell, hence, cyclic photophosphorylation occurs to provide ATP to power other activities in chloroplast.

1. Both assertion and reason are true and the reason is a correct explanation of the assertion
   
2. Both assertion and reason are true but reason is not the correct explanation of the assertion
3. Assertion is true but the reason is false
   
4. Both assertion and reason are false

Q. Electron transport system involved during light reaction is located on:

1. Outer membrane of mitochondria
2. Inner membrane of mitochondria
3. Thylakoid of grana
4. Inner plastid membrane

Q. The substance 3-(3, 4-dichlorophenyl)-1, 1-dimethylurea (DCMU) is a photosynthetic inhibitor. Choose the correct statement about DCMU based on the above information:

1. It can not block non-cyclic photophosphorylation
2. It will have effect on the cyclic photophosphorylation
   
3. It inhibits electron flow from plastoquinones to cytochrome $b_{6}f$
   
4. It inhibits photolysis of water
   

Q. Which is not true regarding the cyclic electron transfer system (ETS) in photosynthesis?

1. A possible location of cyclic electron transfer system is in the stroma lamellae
2. Only PS I is involved
3. Results only in the synthesis of ATP
4. External electron donor is required

Q. Which of the following is correct regarding cyclic photophosphorylation?

1. It involves both PS-l and PS-ll
2. The electrons released from PS-I are again cycled back to PS-I
3. It requires an external electron donor
4. Both ATP and NADPH are formed

Q.

In the above schematic diagram, what is plastocyanin?

1. a

2. b

3. c

4. d