Light Reaction

Q.

Explain ETS.

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 splitting of carbon dioxide to form oxygen gas and carbon compounds occurs during

1. photosynthesis

2. respiration

3. both photosynthesis and respiration

4. neither photosynthesis nor respiration.

Q.

Which of the following is not a product of the light reaction of photosynthesis?

1. NADPH
2. NADH
3. ATP
4. Oxygen

Q.

A photosystem is composed of

1. Light-harvesting complex

2. Granum

3. Reaction centre

4. Reaction centre and light-harvesting complex

Q. Which of the following best describes light reaction?

1. $H_2+\text{Light energy}\to 2H+\text{ATP}+\text{NADPH}$
2. $C{O}_2+\text{Light energy}\to O_2+\text{ATP}+\text{NADPH}$
3. $H_{2}0+\text{Light energy}\to \text{ATP}+\text{NADPH}+O_2$
4. $O_2+\text{Light energy}\to C{O}_2+\text{ADP}+\text{NADPH}$

Q.

Name the cell organelles concerned with trapping of solar energy.

Q. Electron transfer takes place from

1. lower reduction potential to higher reduction potential
2. higher reduction potential to lower reduction potential
3. independent of reduction potential values
4. in a random manner

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. Consider the following statements.
(A) Coenzyme or metal ion that is tightly bound to enzyme protein is called the prosthetic group.
(B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme.
Select the correct option.

1. Both (A) and (B) are true.
2. (A) is false but (B) is true.
3. Both (A) and (B) are false.
4. (A) is true but (B) is false.

Q.

A process which makes an important difference between C₃ and C₄ plants is

1. Glycolysis

2. Photorespiration

3. Transpiration

4. Photosynthesis

Q.

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

1. carbon dioxide

2. water

3. glucose

4. chlorophyll

Q.

What happens during light reaction?

1. Carbon dioxide reacts with hydrogen

2. Synthesis of PGAL

3. Lysis of water molecule

4. Carbon dioxide combines with water

Q.

The correct sequence of flow of electrons in the light reaction is

1. PSI, ferredoxin, PSII, plastoquinone, cytochromes

2. PSI, plastoquinone, cytochromes, PSII, ferredoxin

3. PSII, plastoquinone, cytochromes, PSI, ferredoxin

4. PSI, plastoquinone, cytochromes, PSII, ferredoxin

Q.

What is light harvesting complex? What are the different types of photo systems?

Q. Why the colour of a leaf kept in the dark frequently is yellow or pale green? Which pigment do you think is more stable?

Q. The first step in photosynthesis is

1. joining of three carbon atoms to form glucose
2. formation of ATP
3. ionization of water
4. excitement of an electron of chlorophyll by a photon of light

Q.

what is hill reaction?

Q.

The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?

1. Magnesium and Chlorine

2. Manganese and Chlorine

3. Manganese and Potassium

4. Magnesium and Molybdenum

Q.

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

1. H2O

2. ATP

3. RuBP

4. chlorophyll

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. The first step in photosynthesis is the

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

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

1. In PS – II reaction centre, chlorophyll – a has an absorption peak of 700 nm, hence called p700
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 – I
4. Photo systems – I and II are involved in Z – scheme.

Q.

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

1. H${}_2$O

2. ATP

3. RuBP

4. Chlorophyll

Q.

Look at leaves of the same plant on the shady side and compare it with the leaves on the sunny side. Or, compare the potted plants kept in the sunlight with those in the shade. Which of them has leaves that are darker green? Why?

Q.

ATP synthesis during light reaction is

1. Photophosphorylation

2. Photolysis

3. Oxidative phosphorylation

4. Phosphorylation