Consider the given two statements:
Statement I:
When only PS I is functional, the electron is circulated within the photosystem and the phosphorylation occurs due to cyclic flow of electrons.
Statement II:
Cyclic photophosphorylation also occurs when only light of wavelengths beyond 680 nm are available for excitation.
1.
Both Statement I and Statement II are correct
2.
Both Statement I and Statement II are incorrect
3.
Statement I is correct but Statement II is incorrect
4.
Statement I is incorrect but Statement II is correct
Subtopic: Light Reaction: Electron Transport |
80%
Level 1: 80%+
Hints
Regarding the thylakoid membrane:
| I: | Plastoquinone is located within the membrane |
| II: | Plastocyanin is located on the inner lumen side of the membrane |
| III: | NADP reductase is located on the stroma side of the membrane |
| 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: Chemiosmotic hypothesis |
64%
Level 2: 60%+
Hints
Consider the given two statements:
| Statement I: | CF1 particle of ATP synthase makes ATP molecules. |
| Statement II: | CF1 particle of ATP synthase is embedded in the thylakoid membrane and forms a transmembrane channel that carries out facilitated diffusion of protons across the membrane. |
| 1. | Both Statement I and Statement II are correct |
| 2. | Both Statement I and Statement II are incorrect |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Chemiosmotic hypothesis |
70%
Level 2: 60%+
Hints
The correct chronological stages of the Calvin cycle will be:
| 1. | Carboxylation → Reduction → Regeneration |
| 2. | Carboxylation → Regeneration → Reduction |
| 3. | Regeneration → Reduction → Carboxylation |
| 4. | Reduction → Regeneration → Carboxylation |
Subtopic: Dark Reaction : Calvin Cycle |
95%
Level 1: 80%+
Hints
A C3 plant was provided carbon dioxide labelled with a radioactive isotope. The amount of radioactivity was measured in chloroplasts. In which of the following molecules do you expect the radioactivity to appear first as the process of photosynthesis proceeds in this plant?
| 1. | OAA | 2. | PEP |
| 3. | PGA | 4. | RuBP |
Subtopic: Dark Reaction : Calvin Cycle |
69%
Level 2: 60%+
Hints
RuBP is:
| 1. | 2 carbon ketose sugar | 2. | 2 carbon aldose sugar |
| 3. | 5 carbon ketose sugar | 4. | 5 carbon aldose sugar |
Subtopic: Dark Reaction : Calvin Cycle |
88%
Level 1: 80%+
Hints
Subtopic: C4 Cycle (Hatch & Slack Pathway) | C4 Plants Examples |
84%
Level 1: 80%+
Hints
C4 plants are special. Which of the following will be true for C4 plants?
| (a) | They have a special type of leaf anatomy |
| (b) | They tolerate higher temperature |
| (c) | They show a response to high light intensities |
| (d) | They lack a process called photorespiration |
| (e) | They have greater productivity of biomass |
| 1. | All except (e) |
| 2. | (b), (c) and (d) only |
| 3. | All |
| 4. | (a), (b), (d) and (e) only |
Subtopic: C4 Cycle (Hatch & Slack Pathway) | Photorespiration |
77%
Level 2: 60%+
Hints
In Hatch and Slack pathway:
| I: | The C4 acid OAA is formed in the mesophyll cells. |
| II: | Malic acid or aspartic acid are transported to the bundle sheath cells. |
| III: | C4 acids are broken down to release carbon dioxide and a 3 carbon molecule in mesophyll cells. |
| IV: | The 3 carbon molecule is transported back to the bundle sheath cell where it is converted to PEP again. |
| 1. | Only I and II are correct |
| 2. | II, III and IV are incorrect |
| 3. | Only I, II and III are correct |
| 4. | I, II, III and IV are correct |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
63%
Level 2: 60%+
Hints
When the ratio, CO2 : O2 is nearly equal, RuBisCO:
1. has no affinity for oxygen
2. has a much greater affinity for carbon dioxide
3. has a much greater affinity for oxygen
4. has equal affinity for both carbon dioxide and oxygen
1. has no affinity for oxygen
2. has a much greater affinity for carbon dioxide
3. has a much greater affinity for oxygen
4. has equal affinity for both carbon dioxide and oxygen
Subtopic: Photorespiration |
81%
Level 1: 80%+
Hints
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