Select Chapter Topics:
Q. No.
Assertion(A):
Transfer of electrons from the split water molecule to P680+ is easy.
Reason(R):
P680+ is the strongest biological oxidizing agent known.
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 Reactions |
60%
Level 2: 60%+
Hints
| 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 |
55%
Level 3: 35%-60%
Hints
| 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%
Hints
| 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%
Hints
| 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) |
51%
Level 3: 35%-60%
Hints
| Assertion(A): | When simultaneously exposed to light of both red and far red wavelengths, the rate of photosynthesis is far higher than the sum of the red light and far red light photosynthesis rates. |
| Reason(R): | Two photosystems, processing different wavelengths, cooperate in photosynthesis. |
| 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: Photosystems |
73%
Level 2: 60%+
Hints
| Assertion(A): | A reduction in photorespiration by genetic engineering or because of increasing atmospheric carbon dioxide (due to fossil fuel burning) may not benefit plants as has been proposed. |
| Reason(R): | Photorespiration may be necessary for the assimilation of nitrate from soil. |
| 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: Photorespiration |
Level 3: 35%-60%
Hints
| Assertion(A): | Plants photosynthesise during the day, whereas they respire at night. |
| Reason(R): | Photosynthesis can occur in the presence of sunlight whereas respiration cannot. |
| 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: Introduction | Light Reaction: Electron Transport |
Level 3: 35%-60%
Hints
Chloroplasts:
| I. | have their own DNA and make all proteins needed by them |
| II. | have a uniparental inheritance |
| III. | cannot be made by the plant cell |
| 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 |
Subtopic: Chloroplast Structure | Pigments |
Level 4: Below 35%
Hints
Robin Hill discovered that the isolated chloroplasts from plants can release oxygen when they are illuminated by sunlight in the presence of a suitable electron acceptor. This showed:
| I. | oxygen \((O_2)\) is produced by a reaction that is separate from carbon dioxide \((CO_2)\) fixation. |
| II. | the reaction in which oxygen is released requires light. |
| III. | the light dependent reaction of photosynthesis is a result of a series of redox reactions. |
| 1. | I and II only |
| 2. | I and III only |
| 3. | II and III only |
| 4. | I, II and III |
Subtopic: Historical View: Experiments |
51%
Level 3: 35%-60%
Hints
Select Chapter Topics:
© 2026 GoodEd Technologies Pvt. Ltd.