Select Question Set:
Q. No.
Assertion(A):
Mutant plants that are not able to carry out cyclic electron flow do not grow well in intense light conditions.
Reason(R):
Cyclic electron flow may be photoprotective.
1.
Both (A) and (R) are true and (R) is the correct explanation of (A)
2.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.
(A) is true but (R) is false.
4.
Both (A) and (R) are false.
Subtopic: Light Reaction: Electron Transport |
54%
Level 3: 35%-60%
Assertion: Plastocyanin moves within the thylakoid membranes and plastoquinones move through the thylakoid lumen.
Reason: Plastocyanin is lipid soluble while plastoquinones are not.
| 1. | Both assertion and reason are true and the reason is the correct explanation of the assertion. |
| 2. | Both assertion and reason are true but the reason is not the correct explanation of the assertion. |
| 3. | Assertion is true but reason is false. |
| 4. | Both assertion and reason are false |
Subtopic: Light Reaction: Electron Transport |
Level 4: Below 35%
| Assertion(A): | For every three molecules of \(CO_2\) that enter the Calvin cycle, six molecules of G3P are formed but only one molecule of G3P can be counted as a net gain. |
| Reason(R): | The rest are required to complete the cycle. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false |
Subtopic: Dark Reaction : Calvin Cycle |
66%
Level 2: 60%+
| Assertion(A): | The enzyme phosphoglycerate kinase[PGK] is present in all living organisms. |
| Reason(R): | In the Calvin cycle, PGK catalyzes the phosphorylation of 3-PG, producing 1,3-BPG and ADP, as part of the reactions that regenerate ribulose-1,5-bisphosphate. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Dark Reaction : Calvin Cycle |
Level 3: 35%-60%
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Carbon fixation by RuBisCO can be enhanced by increasing the carbon dioxide level in the compartment containing RuBisCO. |
| Reason (R): | Carbon dioxide and oxygen compete at the active site of RuBisCO. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Dark Reaction : Calvin Cycle |
76%
Level 2: 60%+
| Assertion(A): | Photorespiration is considered as an evolutionary relic. |
| Reason(R): | Unlike normal cellular respiration it uses ATP rather than generating it and unlike photosynthesis it produces no sugar. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of the (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A) |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Photorespiration |
Level 3: 35%-60%
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | PEP carboxylase can fix carbon more efficiently than RuBisCO when it is hot and dry and stomata are partially closed. |
| Reason (R): | PEP carboxylase has a much high affinity for CO2 than RuBisCO and no affinity for O2. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Dark Reaction : Calvin Cycle |
70%
Level 2: 60%+
| Assertion(A): | The primary function of kranz anatomy is to provide a site in which CO2 can be concentrated around RuBisCO, thereby avoiding photorespiration. |
| Reason(R): | The mesophyll cells have a suberized cell wall and have a low conductance for CO2. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
56%
Level 3: 35%-60%
| Assertion(A): | Cyclic electron flow is the only photosynthetic mode of generating ATP for bundle sheath cells. |
| Reason(R): | Bundle sheath cells contain PS I but no PS II. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
Level 3: 35%-60%
| Assertion(A): | CAM is an adaptation for increased efficiency in the use of water, and so is typically found in plants growing in arid conditions. |
| Reason(R): | The most important benefit of CAM to the plant is the ability to leave most leaf stomata open during the day. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false |
Subtopic: CAM Pathway |
65%
Level 2: 60%+
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