Plants can experience abnormal growth similar to cancer, but the concept of cancer in plants is not directly applicable as it is in animals. Agrobacterium tumefaciens is a bacterium that induces tumor-like growths in plants, leading to their death. Additionally, 2,4-Dichlorophenoxyacetic acid, a synthetic herbicide, causes excessive cellular growth by mimicking plant hormones, which can result in abnormal development. However, this excessive growth is not classified as cancer in the same way it is in animals, raising questions about the definition and applicability of cancer in the plant kingdom.