ETC

Q.

Which statement describes the functioning of photosystem II?

1. The P680 chlorophyll donates a pair of protons to NADPH, which is thus converted to NADP+

2. The excitation is passed along to a molecule of P700 chlorophyll in the photosynthetic unit.

3. Light energy excites electrons in the electron transport chain in a photosynthetic unit.

4. The electron vacancies in P680 are filled by electrons derived from water.

Q. Which element is essential as electron carrier?

1. Silver
2. Iron
3. Copper
4. Zinc

Q.

What is the role of the electron transport system in the light-dependent pathway of photosynthesis

1. production of carbon dioxide and water molecules

2. production of NADPH molecules

3. production of oxygen molecules

4. production of glucose molecules

Q.

Light-driven electron transport in the chloroplast pumps H+ into the intermembrane space between the outer and inner membranes.

1. True

2. False

Q.

In the above schematic diagram, what is plastocyanin?

1. a
2. b
3. c
4. d

Q. Which one is essential for the respiration as well as photosynthesis?

1. RuBisCO
2. Ubiquinone
3. Cytochrome
4. Plastocyanin

Q. Cytochrome is:

1. Lipid
2. Metallo flavoprotein
3. Fe containing porphyrin pigment
4. Glycoprotein

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

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