In Kranz anatomy, the bundle sheath cells have :
1. Thick walls, no intercellular spaces and large number of chloroplasts
2. Thin walls, no intercellular spaces and several chloroplasts
3. Thick walls, many intercellular spaces and few chloroplasts
4. Thin walls, many intercellular spaced and no chloroplasts
Subtopic: Â C4 Cycle (Hatch & Slack Pathway) |
 88%
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C4 plants are photosynthetically more efficient than C3 plants because :
1. They have more chloroplasts
2. The CO2 compensation point is more
3. The CO2 efflux is not prevented
4. CO2 generated during photosynthesis is trapped and recycled through PEP-carboxylase
1. They have more chloroplasts
2. The CO2 compensation point is more
3. The CO2 efflux is not prevented
4. CO2 generated during photosynthesis is trapped and recycled through PEP-carboxylase
Subtopic: Â C4 Cycle (Hatch & Slack Pathway) |Â C4 Plants Examples |
 63%
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Experimental O2 entry in C4 - plants would inhibit CO2 fixation reactions in :
1. Bundle sheath cells
2. Mesophyll cells
3. Both (1) and (2)
4. Neither (1) nor (2)
1. Bundle sheath cells
2. Mesophyll cells
3. Both (1) and (2)
4. Neither (1) nor (2)
Subtopic: Â C4 Cycle (Hatch & Slack Pathway) |
 50%
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In C4 cycle, oxaloacetic acid further forms :
1. Malic acid
2. Aspartic acid
3. Malic acid or aspartic acid
4. Succinic acid
1. Malic acid
2. Aspartic acid
3. Malic acid or aspartic acid
4. Succinic acid
Subtopic: Â C4 Cycle (Hatch & Slack Pathway) |
 81%
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Properties of mesophyll cell and bundle sheath cells of a C4 plant is given below, Identify the missing properties marked as A, B, C and D.
1. A = Only PS-II present, B = Photolysis absent, C = Photolysis occurs, D = Carboxylation absent
2. A =Both PS-I and PS-II present, B = Contain more chloroplast, C = Contain less chloroplast, D = RuBisCo present
3. A = Both PS-I and PS-II present , B = Photolysis occurs, C = Photolysis absent, D = Carboxylation occurs
4. A = Lack both PS-I and PS-II, B = Contain less chloroplast, C = Contain more chloroplast, D = RuBisCo present
| Mesophyll cell | Bundle sheath cell |
| Chloroplast granal | Chloroplast agranal |
| A | Only PS-I is present |
| B | C |
| Carboxylation occurs | D |
1. A = Only PS-II present, B = Photolysis absent, C = Photolysis occurs, D = Carboxylation absent
2. A =Both PS-I and PS-II present, B = Contain more chloroplast, C = Contain less chloroplast, D = RuBisCo present
3. A = Both PS-I and PS-II present , B = Photolysis occurs, C = Photolysis absent, D = Carboxylation occurs
4. A = Lack both PS-I and PS-II, B = Contain less chloroplast, C = Contain more chloroplast, D = RuBisCo present
Subtopic: Â C4 Cycle (Hatch & Slack Pathway) |
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If gene alterations cause the plant to be deficient in photorespiration, what would most probably occur?
1. There would be more light induced damage to the cells
2. Less ATP would be generated
3. Less O2 would be produced
4. Photosynthetic efficiency would be reduced at low light intensites
1. There would be more light induced damage to the cells
2. Less ATP would be generated
3. Less O2 would be produced
4. Photosynthetic efficiency would be reduced at low light intensites
Subtopic: Â Photorespiration |
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Photorespiratory pathway is a wasteful process as it :
1. Does not synthesis sugar but release CO2
2. Does not from ATP
3. Does not form NADPH+H+
4. Is responsible for all of the above
1. Does not synthesis sugar but release CO2
2. Does not from ATP
3. Does not form NADPH+H+
4. Is responsible for all of the above
Subtopic: Â Photorespiration |
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C4 plants do not show photorespiration as :
1. C4 acid from the mesophyll is broken down in bundle sheath cells to release CO2
2. RuBisCO in the bundle sheath cell function as carboxylase minimising oxygenase activity
3. Initial carboxylation is done by PEP-case
4. For all the reason mentioned above
1. C4 acid from the mesophyll is broken down in bundle sheath cells to release CO2
2. RuBisCO in the bundle sheath cell function as carboxylase minimising oxygenase activity
3. Initial carboxylation is done by PEP-case
4. For all the reason mentioned above
Subtopic: Â C4 Cycle (Hatch & Slack Pathway) |Â Photorespiration |
 62%
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If atmospheric CO2 concentrations increase two fold or more, how will plants be affected, disregarding any changes in the climate ?
1. All plants will experience increase in photosynthesis
2. C3 plants will have faster growth, C4 plants will be minimally affected
3. C4 plants will have faster growth, C3 plants will be minimally affected
4. Plants growth will not affected because atmospheric CO2 concentrations are never limiting for plant growth
1. All plants will experience increase in photosynthesis
2. C3 plants will have faster growth, C4 plants will be minimally affected
3. C4 plants will have faster growth, C3 plants will be minimally affected
4. Plants growth will not affected because atmospheric CO2 concentrations are never limiting for plant growth
Subtopic: Â C4 Cycle (Hatch & Slack Pathway) |
 60%
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The plant factor affecting photosynthesis is :
1. Amount of chlorophyll
2. Sunlight
3. Soil water
4. All of these
1. Amount of chlorophyll
2. Sunlight
3. Soil water
4. All of these
Subtopic: Â Factors Affecting Photosynthesis |
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