In chloroplast the movement of electrons from PS-II to electron transport system is-
1. uphill in terms of redox potential scale.
2. downhill in terms of redox potential scale.
3. from one cytochrome to another
4. None of the above.

Electrons in the reaction center of PS-I are excited by-
1. blue light
2. red light
3. green light
4. blue and red light

Non- cyclic photophosphorylation involves –
1. PS-I
2. PS-II
3. PS-I and PS-II
4. PS-I and LHC

Where does cyclic photo-phosphorylation takes place?
1. membranous system of chloroplast
2. stroma lamellae
3. grana
4. stroma

Which of the following is present in membrane of stroma lamellae?
1. NADP reductase
2. PS-I
3. PS-II
4. water splitting complex.

If only light of wavelength beyond 680 nm is available then which process will remain continue?
1. cyclic photo-phosphorylation
2. non-cyclic photo-phosphorylation
3. ATP and NADPH
4. evolution of oxygen

Synthesis of ATP from ADP and inorganic phosphate in the presence of light is known as-
1. phosphorylation
2. photo-phosphorylation
3. photorespiration
4.photooxidation

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