STD 12 - 7. human health and disease — BIOLOGY STD 12 Science — Question

d
Cancerous cells which break away from the original site and can spread to the other parts of the body through bloodstream and lymphatic system constitute malignant tumours. The spread of cancer to other sites or organs in the body is called metastasis. Other statements are incorrect as cancer cells do not exhibit the peroperty of contact inhibition, all tumours are not cancerous, e.g., benign tumour and also not all viruses are on cogenic.