Consider the two statements:
I:
Current availability of carbon dioxide levels is limiting to the C4 plants.
II:
C3 plants have a much lower temperature optimum than C4 plants.
1.
Only I is correct
2.
Only II is correct
3.
Both I and II are correct
4.
Both I and II are incorrect
Subtopic: Â C4 Cycle (Hatch & Slack Pathway) |Â C4 Plants Examples |Â Factors Affecting Photosynthesis |
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Level 2: 60%+
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Bundle sheath cells, part of Kranz anatomy in a C4 plant, are not characterized by:
| 1. | May form several layers around the vascular bundle |
| 2. | Have large number of chloroplasts |
| 3. | Have thick walls impervious to gaseous exchange |
| 4. | Large intercellular spaces are seen |
Subtopic: Â C4 Cycle (Hatch & Slack Pathway) |
 85%
Level 1: 80%+
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Match the Scientists given in Column-I with their contribution in Column-II and select the correct match from the codes given:
Codes
| Column-I | Column-II | ||
| A. | Jan Ingenhousz | P. | Provided evidence for production of glucose when plants grow |
| B. | T. W Engelmann | Q. | Described the first action spectrum for photosynthesis |
| C. | Julius von Sachs | R. | Showed that sunlight is essential for photosynthesis |
| D. | Cornelius van Neil | S. | Inferred that oxygen evolved in photosynthesis comes from water and not from carbon dioxide |
| A | B | C | D | |
| 1. | R | Q | P | S |
| 2. | Q | R | S | P |
| 3. | P | S | R | Q |
| 4. | S | P | Q | R |
Subtopic: Â Introduction |Â Historical View: Experiments |
 89%
Level 1: 80%+
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Accessory pigments of photosynthesis in higher plants:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | include chlorophyll b, xanthophylls and carotenoids. |
| II: | absorb light and transfer electrons to chlorophyll a. |
| III: | protect chlorophyll a from photo-oxidation. |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Â Pigments |
Level 4: Below 35%
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What provides the electrons needed to replace those removed from photosystem II during non cyclic photophosphorylation?
| 1. | PS I | 2. | Oxygen |
| 3. | Water | 4. | Carbon dioxide |
Subtopic: Â Light Reaction: Electron Transport |
 87%
Level 1: 80%+
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The reducing power used in Calvin cycle for reduction of carbon dioxide is:
| 1. | NADH | 2. | NADPH |
| 3. | ATP | 4. | Water |
Subtopic: Â Dark Reaction : Calvin Cycle |
 65%
Level 2: 60%+
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When the ratio of carbon dioxide and oxygen in the vicinity of RuBisCO is 1, the affinity of the enzyme:
| 1. | is nearly nil for oxygen |
| 2. | is about equal for both carbon dioxide and oxygen |
| 3. | is much greater for oxygen than carbon dioxide |
| 4. | is much greater for carbon dioxide than oxygen |
Subtopic: Â C4 Cycle (Hatch & Slack Pathway) |
 66%
Level 2: 60%+
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T.W. Engelmann:
| 1. | described a first action spectrum of photosynthesis |
| 2. | provided evidence for production of glucose when plants grow |
| 3. | showed that it is only the green parts of the plant that can release oxygen |
| 4. | first showed that oxygen evolved by the green plant comes from water, not from carbon dioxide |
Subtopic: Â Historical View: Experiments |
 91%
Level 1: 80%+
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In non-cyclic photo-phosphorylation:
| 1. | only PS I is functional |
| 2. | both photosystems work in series, first PS I and then PS II |
| 3. | only ATP synthesis takes place and NADPH is not synthesized |
| 4. | both ATP and NADPH are synthesized |
Subtopic: Â Light Reaction: Electron Transport |
 78%
Level 2: 60%+
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In Sorghum:
| 1. | Calvin cycle takes place in Mesophyll cells |
| 2. | Initial carboxylation reaction occurs in Bundle sheath cells |
| 3. | Number of carbon atoms in the primary carbon dioxide acceptor is 3 |
| 4. | PGA is the primary carbon dioxide fixation product |
Subtopic: Â C4 Cycle (Hatch & Slack Pathway) |Â C4 Plants Examples |
 65%
Level 2: 60%+
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