Which of the following statement is correct?
1. H₂S is the hydrogen donor for purple and green sulphur bacteria
2. H₂O is the hydrogen donor for purple and green sulphur bacteria
3. Oxygen is evolved by the purple and green sulphur bacteria
4. Oxygen evolved by the green plants comes from the CO₂.

The mechanism of ATP synthesis is explained by
1. Chemiosmotic Hypothesis
2. Photophosphorylation
3. Electron Transport Chain
4. Splitting of Water

ATP synthesis is linked to-
1. Development of electron gradient
2. Development of atomic gradient
3. Development of proton gradient
4. Flow of electrons across the membrane

The difference in development of proton gradient in photosynthesis and respiration is-
1. Photosynthesis has thylakoid membrane across which proton gradient is generated
2. Proton accumulation is inside the membrane of thylakoid.
3. both a and b
4. Mitochondrial membrane is involved

What does not cause the proton gradient across the membrane?
1. Splitting of water
2. Moving electrons through photosystems
3. Reduction of NADP
4. Q cycle

Where does the splitting of water take place?
1. Stroma
2. Cytoplasm
3. Thylakoid lumen
4. Plasma membrane

Fill in the blank according to the causes of the proton gradient in photosynthesis :
The ________ accepter of ______, which is located towards the ____ side of the membrane, transfers its electron not to an electron carrier but to an _____.
1. Primary, proton, inner, proton carrier
2. Primary, electron, outer, H carrier
3. Terminal, proton, outer, proton carrier
4. Primary, electron, inner, H carrier

Where does exactly the NADP reductase enzyme located?
1. Thylakoid lumen
2. Thylakoid luminal side of membrane
3. Stromal side of thylakoid membrane
4. Cytoplasm

The protons for the reduction of NADP⁺ are taken from-
1. Stroma
2. Lumen of Thylakoid
3. Cytoplasm
4. Matrix

Within chloroplast, number of protons is less in which compartment?
1. Thylakoid membrane
2. Intermembrane space
3. Stroma
4. Matrix