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Cancer cells are more easily damaged by radiation therapy than normal cells mainly because cancer cells are:
ADifferent in basic structure
BPermanently non-dividing
CAlready partly destroyed
DUndergoing rapid division
Answer & Solution
Correct answer: D. Undergoing rapid division
1. Radiation therapy uses lethal doses targeted at tumour cells while sparing normal cells.
2. Cancer is uncontrolled, rapid cell division, and rapidly dividing cells are more vulnerable to radiation.
3. Option B contradicts this by calling them non-dividing, so it is a trap.
4. Hence the answer is D.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit "Health and Diseases", p.318_
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