人和动物都会患癌病。有趣的是,植物也会生癌病,而且与人和动物的癌病极为相似。在栎树等一些植物表皮下的组织里,常常有一种叫瘿蜂的昆虫在那里产卵,逐渐形成虫瘿,它会引起植物组织的癌变。受伤植物的伤口感染到细菌、病毒,就会患肿根病,畸形生长,甚至导致癌症。植物得了癌症以后,很快就会蔓延到其他正常的组织部位,出现恶性肿瘤。科学家发现,原生的癌组织里感染有细菌或病毒,而次生的癌组织里,却没有细菌或病毒。人们把这种患有肿瘤的树枝剪切下来,将其嫁接在正常植株上,结果那些 People and animals will get cancer. Interestingly, plants also become cancerous and very similar to cancers in humans and animals. In the tissues of the epidermis of some plants such as the oak tree, there is often a kind of insects called Apis mellifera spawning and gradually forming worms that cause canceration of plant tissues. Injured plant wounds infected with bacteria, viruses, will edema, deformity growth, and even lead to cancer. After the plant got the cancer, it quickly spread to other normal tissues and developed malignant tumors. Scientists found that the original cancer tissue infected with bacteria or viruses, and secondary cancer, but no bacteria or viruses. People cut the tumor-bearing branches and grafted them onto normal plants. As a result, those