(i) Mention the two corollaries that have to be understood about memory based acquired immunity. |
(ii) Why is the phenomenon of metastasis considered fatal? |
Answer:
(i) Two corollaries that have to be understood about memory based acquired immunity are (a) Higher vertebrates can distinguish foreign organisms from their self-cells. (b) Due to genetic or unknown reasons, body attacks self-cells and causes autoimmune diseases. (ii) Metastasis is the phenomenon where sloughing off of tumour cells occur, which reach other parts of body via blood and start a new tumour. It is a very fatal property of malignant tumours.
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