Light Reaction

Q. The assimilatory power(s) produced during light reaction is/are

1. only ATP
2. only NADP
3. both ATP and NADPH
4. only NADPH

Q. The thylakoid membrane becomes damaged, causing the inside of the thylakoid to mix with the stroma. Which of the following processes is likely to be most affected by this damage?

1. The reduction of ${\mathrm{NADP}}^{+}$ to NADPH
2. Sunlight absorption by the chloroplasts
3. The movement of electrons from photosystem II (PSII) to photosystem I (PSI)
4. ATP synthesis

Q. Light energy in photosynthesis is utilised in

1. H₂O converted into H₂
2. ADP converted into ATP
3. ATP converted into ADP
4. None of the above.

Q. Plants adapted to low light intensity have:

1. Higher rate of $C{O}_2$ fixation than the sun plants
2. More extended root system
3. Leaves modified to spines
4. Larger photosynthetic unit size than the sun plants

Q. Which of the following is the correct pathway of the electron during light reaction?

1. PC→ PQ→ Fd→ Fe-S
2. Fd→ Fe-S→ PC→ PQ
3. Fd→ PC→ PQ→ Fe-S
4. PQ→ PC→ Fe-S→ Fd

Q.

Ferredoxin is a component of the

1. Hill reaction

2. Photosystem I

3. P680

4. Photosystem II

Q. Arrange in the correct sequence of electron transfer in Z -scheme of light reaction

1. ETS
2. $e^{-}acceptor$
3. Photosystem I
4. $NAD{P}^{+}$
5. Photosystem II

Q. In glycolysis, during oxidation electrons are removed by:

1. Glyceraldehyde-3-phosphate
2. $NA{D}^{+}$
3. Molecular oxygen
4. ATP

Q. Photolysis of water is involved in

1. filling electron gap in PS II
2. filling electron gap in PS I
3. creating electrochemical proton gradient
4. both a and c

Q.

The oxygen that is released as O${}_2$ during photosynthesis came from _____________ molecules.

1. carbon dioxide

2. water

3. glucose

4. chlorophyll

Q.

Which of the events listed below occur in the light reactions of photosynthesis?

1. NADPH is reduced to NADP+.

2. carbon dioxide is incorporated into PGA.

3. ATP is phosphorylated to yield ADP.

4. light is absorbed and funneled to reaction-center chlorophyll a.

Q. A herbicide that blocks electron transport from PS-II to PS-I by inhibiting electron flow between PSII and plastoquinone is______

1. DCMU
2. Paraquat
3. DCPIP
4. None of these

Q. When does evolution of $O_2$ occur?

1. Cyclic photophosphorylation
2. Non-cyclic photophosphorylation
3. Splitting of water
4. Both b and c

Q. Plastoquinone (PQ) carries electrons from

1. Fe-S→ FNR
2. Cyt $b_{6}f$→ P700
3. P680→ pheophytin
4. Pheophytin→ cyt $b_{6}f$

Q. Assimilatory power that is produced in the light reaction and used in Blackman’s reaction referes to the

1. Generation of ATP and $NADP{H}_2$
2. Reduction of $C{O}_2$
3. Splitting of water
4. Disintegration of plastids

Q. Light dependent reaction of photosynthesis occurs in the

1. stroma
2. thylakoid membrane
3. inner membrane of chloroplasts
4. intermembrane space of chloroplast
   

Q.

Which of the following sequences correctly represents the flow of electrons during photosynthesis?

1. NADP${}^{+}$$\to$ O${}_2$ $\to$ CO${}_2$

2. H${}_2$O $\to$ NADP${}^{+}$ $\to$ Calvin cycle

3. NADP${}^{+}$ $\to$ chlorophyll $\to$ Calvin cycle

4. H${}_2$O $\to$ photosystem I $\to$ photosystem II

Q. Which of the following is the correct pathway of the electron during light reaction?

1. Fd→ PC→ PQ→ Fe-S
2. PC→ PQ→ Fd→ Fe-S
3. PQ→ PC→ Fe-S→ Fd
4. Fd→ Fe-S→ PC→ PQ

Q. Where is ferredoxin-${\mathrm{NADP}}^{+}$-reductase (FNR) found in the leaf?

1. Lumen of thylakoid
2. Membrane of thylakoid
3. Stroma of thylakoid
4. Within the photosystem

Q. How many electrons, protons and photons are involved in the lysis of water to evolve one molecule of oxygen?

1. $4e^{–},4H^{+}$ and 4 photons
2. $4e^{–},4H^{+}$ and 8 photons
3. $2e^{–},2H^{+}$ and 8 photons
4. $2e^{–},2H^{+}$ and 4 photons

Q. Where is ferredoxin (Fd) found in the leaf?

1. Lumen of thylakoid
2. Stroma lamellae
3. Stroma of thylakoid
4. Within the photosystem