Before You Begin
Question #47593
The Question
A genetic mutation in a dominant plant species alters the binding affinity of the Mn-Ca-Cl cluster located on the inner side of the thylakoid membrane. Considering both the biochemical impact and Paul Ehrlich's Rivet Popper Hypothesis, which of the following statements is NOT correct regarding the consequences of this mutation?
Options
- A.
The establishment of the proton gradient is impaired due to the failure of 2H2O → 4H+ + O2 + 4e- in the thylakoid lumen.
- B.
Cyclic photophosphorylation will immediately cease because the primary electron acceptor of PS II can no longer transfer electrons to the cytochrome b6f complex.
- C.
The reduction of NADP+ to NADPH + H+ on the stroma side is halted due to the lack of electron replenishment to the P680 reaction center.
- D.
The decline of this dominant producer acts as the loss of a 'key rivet' on the airplane wing, disproportionately destabilizing the local ecosystem.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Evolutionary_Exception
Tackle problems where standard rules evolve or change based on specific environmental constraints.
Concepts Behind This Question
Photolysis of Water Stoichiometry|Diversity-Stability Relationship|Rivet Popper Hypothesis
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often assume that halting the Oxygen Evolving Complex (OEC) shuts down all light reactions.
However, cyclic photophosphorylation operates independently of PS II and water splitting, utilizing only PS I to generate ATP.
The question also tests the ability to synthesize micro-biochemical facts (OEC location/function) with macro-ecological concepts (Rivet Popper Hypothesis).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Photosynthesis in Higher Plants - Class 11 |
| Concept | Photolysis of Water Stoichiometry |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |