Correct Option
The passage concludes by emphasizing that the practical sustainability of pesticide use depends on "continually developing new pesticides that keep at least one step ahead of the pests - pesticides that are less persistent, biodegradable and more accurately targeted." This statement directly implies the necessity of exploring and promoting alternative or improved approaches to pest management, which could encompass both novel chemical formulations and non-chemical methods, to counter the evolution of resistance and ensure long-term effectiveness.
Incorrect Options
- Option (b): Too much use of chemicals is not good for the ecosystem. While the passage highlights the problem of pesticide resistance, which is an ecological concern, its primary implication is not a broad warning against chemical overuse for general ecological harm. Instead, it focuses on the specific challenge of resistance evolution and the strategies required for the sustainable application of pesticides. The passage also discusses the economic and social justifications for continued pesticide use.
- Option (c): There is no scope for the improvement of pesticides and making their use sustainable. This statement directly contradicts the passage. The text explicitly states that "sustainability depends on continually developing new pesticides that are less persistent, biodegradable and more accurately targeted." This clearly indicates that there is significant scope for improving pesticides and making their use more sustainable.
- Option (d): Both the statements (a) and (b) above are correct. This option is incorrect because statement (b) is not the most accurate or central implication of the passage.