Light Reaction

Q. Light energy in photosynthesis is utilised in

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

Q. Choose the correct statement:

1. Reduction of NAD to NADH to occurs in Calvin Cycle.
2. S. Ochoa showed ${\mathrm{NADP}}^{+}$ is the biological electron acceptor in the chloroplast.
   
3. Fixation and reduction of carbon dioxide requires ATP, NADPH and light.
4. NADH produced in light reaction is used for reduction of carbon dioxide.

Q.

During what stage of photosynthesis is O${}_2$ produced?

1. cyclic photophosphorylation

2. the light-dependent reactions involving photosystems I and II

3. carbon fixation

4. the Krebs cycle

Q. Which of the following statements is true with regard to the light reaction of photosynthesis?

1. Photo systems – I and II are involved in Z – scheme.
2. In PS – I, the reaction centre chlorophyll –a has an absorption maxima at 680 nm and is called p680
3. The splitting of water molecule is associated with PS – II
4. In PS – II reaction centre, chlorophyll – a has an absorption peak of 700 nm, hence called p700

Q.

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

1. carbon dioxide is incorporated into PGA.

2. ATP is phosphorylated to yield ADP.

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

4. NADPH is reduced to NADP+.

Q.

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

1. NADPH → chlorophyll → Calvin cycle

2. H2O → photosystem I → photosystem II

3. NADPH → O2 → CO2

4. H2O → NADPH → Calvin cycle

Q.

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

1. water

2. carbon dioxide

3. glucose

4. chlorophyll

Q.

During photosynthesis, photons raise electrons to higher energy levels. These excited electrons belong to what compound?

1. RuBP

2. ATP

3. H2O

4. chlorophyll

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. The first step in photosynthesis is the

1. Excitement of an electron of chlorophyll by a photon of light
   
2. Ionization of water
3. Joining of 3-carbon atom to form glucose
4. Formation of ATP