Correct Option (D)
The passage describes an experiment where low-intensity amber light inhibited flowering in a wild plant, which serves as a food source for pea-aphids. This inhibition directly impacted the aphid population, leading to its significant suppression due to limited food availability. This demonstrates a clear causal link where specific light characteristics (intensity and colour) affect plant growth (flora) and subsequently impact the animal population (fauna) dependent on those plants. Therefore, the inference that proper light intensity and type are crucial for both plants and animals in an ecosystem is directly supported.
Incorrect Options:
The passage details the effects of low-intensity amber light but does not provide any comparative data regarding the effects of high-intensity light on plants. Thus, no inference can be drawn about whether low-intensity light has a more adverse effect than high-intensity light.
While the passage illustrates adverse ecological impacts of artificial light, it does not offer information about the permanence or long-term duration of these effects on the ecosystem. Therefore, stating that the impact is permanent cannot be inferred from the given text.
The passage mentions white light as one of the types used in the simulation but does not present any findings or comparisons to suggest that white light is superior for plant flowering compared to other colours. The primary observation regarding flowering inhibition is attributed to amber light.