QAL Laws & Regulation Practice Exam

Which of the following is an example of a biological control method?

1. Using herbicides to kill weeds

2. Introducing natural predators into an ecosystem

3. Implementing crop rotation practices

4. Applying insecticides indiscriminately

The correct answer is: Introducing natural predators into an ecosystem

The choice of introducing natural predators into an ecosystem is indeed an example of a biological control method. Biological control involves the use of living organisms to manage pest populations, which can include introducing natural enemies such as predators, parasites, or pathogens that naturally suppress pest numbers. This approach aims to enhance the natural balance within an ecosystem and reduce reliance on chemical controls, promoting a more sustainable agricultural practice. In contrast, using herbicides to kill weeds and applying insecticides indiscriminately are examples of chemical control methods, which involve the use of synthetic substances to manage pests. These methods can lead to environmental concerns, such as toxicity to non-target species and potential harm to the ecosystem. Implementing crop rotation practices, while effective in pest management and improving soil health, is considered an agronomic practice rather than a direct biological control method. Therefore, the introduction of natural predators represents a direct application of biological principles for pest management.