In photorespiration, glycolate is converted into serine and carbon dioxide in:

1. Mitochondria

2. Cholorplasts

3. Vacuoles

4. Peroxisomes

Subtopic:  Photorespiration |
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In the C4 pathway, which of the following molecules combines with carbon dioxide?

1. glyceraldehyde phosphate

2. ribulose biphosphate

3. phosphoenol pyruvic acid

4. citric acid

Subtopic:  C4 Plants Examples | Question on C4 Pathway |
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Dark reactions of photosynthesis are actually not totally independent of light as:

(1) The initial reactions occur in the presence of light.

(2) The reaction will be inhibited by the presence of light.

(3) They can occur during the day as well.

(4) They utilize the products of the light reaction.

Subtopic:  Dark Reaction: Biosynthetic Phase |
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All the following regarding the role of xanthophylls and carotenoids in photosynthesis are correct except:

1. They act as accessory pigments

2. Their peak absorption is in blue and red regions of VIBGYOR

3. They enable a wider range of wavelength of incoming light to be utilized for photosynthesis

4. They protect chlorophyll a form of photo-oxidation.

Subtopic:  Photosystems |
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Which stage of the Calvin Cycle utilizes ATP?

(1) Carboxylation

(2) Reduction

(3) Regeneration

(4) Both 2 and 3

Subtopic:  Dark Reaction : Calvin Cycle |
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Compared to retinal, chlorophyll can be described as a pigment that has a 

1. narrow absorption range but high efficiency

2. narrow apsorption range but low efficiency

3. wide absorption range but high effeciency

4. wide absorption range but low efficiency

Subtopic:  Pigments |
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Consider the situation where photosynthesis is going on at a steady pace in a typical experiment with a light on, and carbon dioxide is being combined with ribulose-bisphosphate (RuBP) to produce 3-phosphoglycerate (3PG). Then suddenly the source of carbon dioxide is eliminated. What changes in the concentrations of 3PG and RuBP would occur?

1. 3PG levels rise, RuBP levels fall.

2. 3PG levels fall, RuBP levels rise.

3. 3PG levels rise, RuBP levels rise.

4. 3PG levels fall, RuBP levels fall.

Subtopic:  Light Reaction: Photophosphorylation |
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Identify the statement that is true for C4 plants but not for C3 plants?

1. Initially fix carbon dioxide in mesophyll cells as 4-carbon long compounds.

2. Initially fix carbon dioxide in bundle sheath cells as 3-carbon long compounds.

3. Initially fix carbon dioxide in mesophyll cells as 3-carbon long compounds.

4. Initially fix carbon dioxide in bundle sheath cells as 4-carbon long compounds.

Subtopic:  C4 Cycle (Hatch & Slack Pathway) |
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Crops such as tomatoes and bell pepper, allowed to grow in a carbon dioxide rich environment, show higher yields because:

(1) They show an increased rate of photosynthesis at higher carbon dioxide concentrations

(2) They can respond to high carbon dioxide conditions even in low light conditions.

(3) They show C4 pathway for cabon fixation at high carbon dioxide is the limiting factor in such plants. 

(4) Only carbon dioxide is the limiting factor in such plants

Subtopic:  C4 Plants Examples |
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At about what percentage of the full sunlight does light saturation occurs in photosynthesis?

(1) 10

(2) 25

(3) 70

(4) 95

Subtopic:  Factors Affecting Photosynthesis |
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