Light Reaction

Q.

Photolysis of water is caused by

1. PS - I

2. PS - II

3. PS - 1 and PS - II

4. None of the above

Q.

Statement 1: More chloroplasts are found on the upper part of the leaf.

Statement 2: Photosynthesis takes place in the leaves.

1. Both the statemnts are false

2. Statement 1 is true and statement 2 is false

3. Statement 1 is false and statement 2 is true

4. Both the statements are true

Q.

What is the full form of NADP⁺?

Q.

Splitting of $H_{2}O$ molecules into hydrogen ions and oxygen in the presence of light and stroma is photolysis.

1. True

2. False

Q.

The end result of the products of the photolysis is/are:

1. Molecular Oxygen

2. ATP

3. NADPH

4. Carbon dioxide

Q.

How do plants use water in photosynthesis?

Q.

During photosynthesis, oxygen is evolved from _____.

1. water

2. sunlight

3. proteins

4. carbohydrates

Q.

The light reaction in a photochemical phase takes place in which of the following locations?

1. Thylakoids

2. Stroma

3. Outside the chloroplast

4. Both stroma and thylakoids

Q.

The energy used in phosphorylation comes from photons. The process is hence termed ___.

1. Photophosphorylation

2. Phosphorylation

3. Electrophosphorylation

4. All of the above

Q.

The dark reaction or Calvin-Benson cycle:

1. Water into oxygen to generate ATP

2. Fixes carbon dioxide to make glucose

3. Fixes water to make glucose

4. Fixes water to make light

Q.

This question consist of two statements, assertion and reason. While answering this question you are required to choose any one of the following five responses.

Assertion: In light reaction of photosynthesis, light is required for the functioning of $PSI$ and $PSII,$ and production of $\text{NADPH}$ and $\text{ATP.}$

Reason: Dark reaction doesn’t occur in light.

1. If assertion is false but the reason is true.

2. If both assertion and reason are false.

3. If both assertion and reason are true but the reason is not the correct explanation of the assertion.

4. If assertion is true but the reason is false.

5. If both assertion and reason are true and the reason is the correct explanation of the assertion.

Q.

The light reaction breaks ____.

1. carbon dioxide into oxygen to produce glucose

2. oxygen intothe water to generate ATP

3. water into oxygen to generate ATP

4. carbon dioxide into oxygen to generate ATP

Q. If photosynthesis does not take place in a plant during the day time, then the plant releases

1. Water vapour.
2. Oxygen.
3. Carbon dioxide.
4. None of the above.

Q. Which of the following is/are needed by plants for photosynthesis?

1. Water
2. Oxygen
3. Carbon dioxide
4. Light

Q. When 8 molecules of RUBP is utilised in photorespiration , the number of PGA formed is

1. 8
2. 16
3. 12
4. 9

Q.

Choose one or more option(s).
During Photosynthesis, oxygen is produced by ___and carbon dioxide is utilized for ___ .

1. water; energy production

2. photolysis of water; trapping solar energy

3. photolysis of water; carbohydrate formation

4. carbohydrate formation, energy release

Q.

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

1. ATP is phosphorylated to yield ADP.

2. NADPH is reduced to $NAD{P}^{+}$.

3. Light is absorbed and funnelled to reaction-centre chlorophyll a.

4. Generation of 2 ATP moleules

Q.

Which of the following occur(s) in grana?

1. double membrane

2. grana

3. stroma lamella

4. stroma

Q.

Consider the diagram below which represents photosynthetic reactions. Choose the option that correctly matches the labels (i), (ii), (iii).

1. (i) Oxygen, (ii) Water, (iii) Carbon dioxide; chlorophyll is used in b-Calvin Benson cycle

2. (i) Water, (ii) Carbon dioxide, (iii) Oxygen; chlorophyll is used in b-Calvin Benson cycle

3. (i) Water, (ii) Oxygen, (iii) Carbon dioxide; chlorophyll is used in a-Light reactions

4. (i) Carbon dioxide, (ii) Oxygen, (iii) Water; chlorophyll is used in a-Light reactions

Q. During light reaction, is broken down into hydrogen ion and oxygen.

1. glucose
2. carbon dioxide
3. water
4. ATP

Q.

$C{O}_2$ fixation occurs within the stroma.

1. True

2. False

Q. The source of $O_2$ liberated in photosynthesis in green plants is:

1. Photosynthetic enzyme
2. Carbohydrates present in leaf
3. Water
4. Carbon dioxide

Q. Reduced coenzyme NADPH $\left(H^{+}\right)$ is produced in respiration during

1. Krebs cycle
2. Terminal oxidation.
3. PPP
4. Glycolysis

Q. Explain the complete KREBS CYCLE elaborately and also all the functioning mechanism of the mitochondria.

Q. Select the events which occur during light dependent reaction.​

1. Carbon dioxide is reduced to starch. ​
2. Oxygen is given out during this process.​
3. Light energy is converted into chemical energy.​
4. Water is split into hydroxyl and hydrogen ions.​

Q. Electrons from excited chlorophyll of PS II are accepted first by

1. Quinone
2. Cytochrome f
3. Cytochrome b
4. Ferredoxin

Q.

Light is needed for the Calvin - Benson cycle.

1. True

2. False

Q.

Plants produce 1mol of glucose after 2 dark phases.

1. True
2. False

Q. In photosynthesis, there is an (a)

1. Reduction of $H_{2}O$.
2. Oxidation of $H_{2}O$.
3. Oxidation of $C{O}_2$.
4. Oxidation of $N{O}_2$.