Concept:A pest is an organism that directly attacks, feeds on, or damages crop plants.
Bacteria are not called pests because they cause diseases and are classified as pathogens.
Explanation:Birds eat seeds and fruits, so they damage cultivated plants and act as pests.
Nematodes attack plant roots and cause stunted growth, making them agricultural pests.
Rodents chew on grains, stems, and roots, destroying crops in the process.
Bacteria, in contrast, infect plant tissues and produce diseases rather than feeding on plants directly.
Therefore, among the given options, bacteria do not fit the definition of a plant pest.
Answer:C. bacteria