Which of the following is a potential concern regarding genetically modified plants?

The concern of unplanned ecosystem interactions is significant when it comes to genetically modified plants. This issue arises from the potential for modified genes from these plants to transfer to wild relatives or non-target species through cross-pollination. Such interactions can disrupt local ecosystems, potentially leading to unintended consequences like the emergence of "super weeds" that are resistant to herbicides or alterations in the population dynamics of native species. These ecological impacts are difficult to predict and can have long-lasting effects on biodiversity and ecosystem health.

In contrast, reduced pesticide and herbicide use, improved agricultural yield and profit, and increased genetic variation and diversity are often considered benefits of genetically modified organisms. While they can enhance agricultural practices and contribute positively to food security, they do not directly address the potential ecological risks that come with the introduction of these organisms into existing environments. Understanding the complexities of ecosystems is crucial when evaluating the implications of introducing genetically modified plants into those systems.