Final answer:
A mutation eliminating photosystem II in a plant would disrupt the production of ATP and NADPH during photosynthesis, impeding the Calvin cycle and the plant's ability to synthesize glucose, impacting its growth and survival.
Step-by-step explanation:
If a plant had a mutation that eliminated its photosystem II complex, it would be unable to perform the light-dependent reactions of photosynthesis efficiently, as photosystem II is responsible for the initial steps of converting light energy into chemical energy. Without photosystem II, the plant cannot oxidize water (H2O) to release electrons, which are necessary for producing ATP and NADPH. As a result, the Calvin cycle, which depends on ATP and NADPH, would be disrupted. The plant would struggle to synthesize sufficient G3P, which is necessary for the production of glucose and other sugars. Ultimately, the absence of photosystem II would significantly hinder the plant's ability to produce energy and carbon-based molecules, essential for its growth and survival.