question_answer 26)

  In malignant tumours, the cells proliferate, grow rapidly and move to other parts of the body to form new tumours. This stage of disease is called        (a) metagenesis               (b) metastasis                   (c) teratogenesis              (d) mitosis

Answer:

                  (b) Cancer is defined as an uncontrolled division or proliferation of cells without any differentiation. Repeated division of cells form a large mass of tissue called tumours. Tumours are of two types i.e., benign (non-cancerous) and malignant (cancerous). The invasion of cancerous cells (in malignant tumours) from one part to the other parts of body is called metastasis, while metagenesis is the alteration of generation. Tetra genesis is a prenatal toxicity characterized by structural, functional defects in the developing embryo or fetus. Mitosis is a type of cell division that results in two daughter cells.