a corn plant has been genetically engineered produces pollen that can make its own toxins these toxins protect the corn plant against pests what is a likely impact on the environment around the corn plant

The environment around the plant would not get nutrients.

Disruption in number of plant species around the corn plant and hence the desalinization of ecosystem.

Explanation:

The other plants around the corn plant will be attacked and destroyed severely by the pests. Since corn is pest resistant, it will not be effected by pest attacks but other crops will get damaged.

In this way the biodiversity will reduce as the corn plants could not mate with any other plant species (which die due to pest attack).

hence, the ecosystem will get destabilize.