Light Reactions

Q. What is the meaning of bio catalyst?

Q.

What are light and dark reactions?

Q.

What is the connecting substance between light reaction and dark reaction?

Q.

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

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

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

3. ATP is phosphorylated to yield ADP.

4. Generation of 2 ATP molecules.

Q.

What is photophosphorylation?

Q.

What process makes ATP in photosynthesis?

Q. The primary function of light dependent reaction is to produce .

1. NADPH and ATP
2. Carbon dioxide & ATP
3. Glucose & NADPH

Q.

Consider the diagram below which represents photosynthetic reactions. Choose the option that correctly matches the names to the numbers (i), (ii), (iii). Also the option must match for the involvement of chlorophyll, i.e., a-Light reaction or b-Calvin-Benson Cycle.

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

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

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

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

Q.

The part of the chloroplast where the light reaction of photosynthesis takes place.

Q. (i) Define dark reaction.
(ii) Give an overall balanced equation of this process
(iii) Describe an experiment to prove that sunlight is necessary for photosynthesis.
(iv) Mention any two points in which photosynthesis and respiration in plants are opposite to each other.

Q.

The chemical reactions which proceed with the absorption of light energy are called _____reactions

Q.

The ________ is the cell organelle where photosynthesis occurs.

Q. Define the following
(a) Light reaction
(b) Quantum
(c) Dark reaction

Q.

In a light-dependent phase, the hydrogen ions are picked up by a compound NADP to from ___.

1. ATP

2. Proteins

3. Proteins and carbohydrates

4. NADPH

Q. Define the following:
(i) Plant pigments
(ii) Quantum
(iii) Organic food
(iv) Light reaction
(v) Photolysis in photosynthesis

Q.

differentiate b/w photophosphorylation and oxidative phosphorylation

Q.

How do elements activate enzymes?

Q.

What is mecanism of photosynthesis.Information should be 10 pages for project

Q.

Very Short Answer Types :
What is oxidative phosphorylation?

Q.

Name the process involving the combination of ADP with an inorganic phosphate to produce ATP.

Enter 2 words or less.

Q. The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triophosphate (ATP) is formed because _______.

1. A proton gradient forms across the inner membrane
2. ADP is pumped out of the matrix into the intermembrane space
3. There is a change in the permeability of the inner mitochondrial membrane towards adenosine diphosphate (ADP)
4. High energy bonds are formed in mitochondrial proteins

Q.

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

1. True

2. False

Q.

Where does the reaction $2H_{2}O\to 4H^{+}+O_2+4e^{-}$ take place in the chloroplast of plants?​

1. Intermembrane space

2. In the stroma

3. Outer surface of thylakoid membrane

4. Inner surface of thylakoid membrane

Q.

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

1. production of glucose molecules

2. production of NADPH molecules

3. production of carbon dioxide and water molecules

4. production of oxygen molecules

Q.

The light reaction breaks:

1. Carbon dioxide into oxygen to generate ATP

2. Carbon dioxide into oxygen to generate Glucose

3. Carbon dioxide into water to generate ATP

4. Water into oxygen to generate ATP

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.

Light is needed for the Calvin - Benson cycle.

1. False

2. True

Q.

What do you mean by oxidative phosphorylation?

Q. Photolysis of a water molecule yields

1. 2 electrons and 4 protons
2. 2 electrons and 2 protons
3. 4 electrons and 2 protons
4. 4 electrons and 4 protons

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