Q. No.The site of light reactions and dark reactions in chloroplasts are:
| 1. | Both occur in the stroma. |
| 2. | Light reactions occur in the thylakoid membranes, and dark reactions occur in the stroma. |
| 3. | Light reactions occur in the stroma, and dark reactions occur in the thylakoid membranes. |
| 4. | Both occur in the thylakoid membranes. |
Subtopic: Light Reaction: Electron Transport | Dark Reaction: Biosynthetic Phase |
89%
Level 1: 80%+
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In PS I the reaction centre chlorophyll a has an absorption peak at:
1. 400 nm
2. 430 nm
3. 680 nm
4. 700 nm
1. 400 nm
2. 430 nm
3. 680 nm
4. 700 nm
Subtopic: Light Reaction: Electron Transport |
93%
Level 1: 80%+
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In the light reactions, the function of the reaction center chlorophyll in Photosystem II (PS II) is specifically to:
| 1. | Absorb light of 700 nm and release electrons to an electron acceptor |
| 2. | Absorb light of 680 nm and transfer excited electrons to an electron transport chain |
| 3. | Produce ATP and NADPH directly |
| 4. | Store energy by synthesizing carbohydrates |
Subtopic: Light Reaction: Electron Transport |
90%
Level 1: 80%+
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In the thylakoid membranes, what is the main role of the antenna pigment molecules?
| 1. | split water and release oxygen to the reaction-center chlorophyll |
| 2. | harvest photons and transfer light energy to the reaction-center chlorophyll |
| 3. | synthesize ATP from ADP and Pi |
| 4. | transfer electrons to ferredoxin and then NADPH |
Subtopic: Photosynthetic Pigments | Light Reaction: Electron Transport |
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Cyclic photophosphorylation differs from non-cyclic in that it:
| 1. | Involves only PS-I and produces ATP without NADPH or O₂ |
| 2. | Uses both PS-I and PS-II to generate NADPH and ATP |
| 3. | Releases oxygen as a byproduct |
| 4. | Requires an external electron donor like water |
Subtopic: Light Reaction: Electron Transport |
84%
Level 1: 80%+
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The enzyme ATP synthase has two parts: ______ embedded in membrane and ______ protruding into the matrix.
1. F₀; F₁
2. F₁; F₀
3. α; β
4. NAD; FAD
1. F₀; F₁
2. F₁; F₀
3. α; β
4. NAD; FAD
Subtopic: Light Reaction: Electron Transport |
87%
Level 1: 80%+
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In non-cyclic photophosphorylation, electrons lost by the reaction center chlorophyll in PS II are replenished by:
| 1. | NADPH | 2. | CO2 |
| 3. | Water | 4. | Glucose |
Subtopic: Light Reaction: Electron Transport |
84%
Level 1: 80%+
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In oxygenic photosynthesis, the release of oxygen is a byproduct of:
1. chemiosmosis
2. reducing by FNR
3. splitting the water molecules
4. cyclic photophosphorylation
Subtopic: Light Reaction: Electron Transport |
86%
Level 1: 80%+
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What happens in light reaction (Photo chemical reaction):
| 1. | Formation of ATP and NADPH2 |
| 2. | Formation of ATP |
| 3. | Formation of sugar |
| 4. | Breakdown of sugar |
Subtopic: Light Reaction: Electron Transport |
90%
Level 1: 80%+
AIPMT - 2000
Hints
According to the Z-scheme of the light reactions, electrons flow through a specific sequence of carriers. What is the correct path of this non-cyclic electron flow?
| 1. | PS I → Plastoquinone → Cytochromes → PS II → Ferredoxin |
| 2. | PS I → Ferredoxin → PS II |
| 3. | PS II → Plastoquinone → Cytochromes → PS I → Ferredoxin |
| 4. | PS II → Cytochromes → Plastoquinone → PS I → Ferredoxin |
Subtopic: Light Reaction: Electron Transport |
83%
Level 1: 80%+
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