Radioactive isotopes are used in:

food preservation

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industrial field

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medical science

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agriculture

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Solution

The correct option is D agriculture
Radioactive isotopes are used in various fields such as scientific research, agriculture, industry, medicine, food preservation, etc. For example:

Krypton-85 is used in high intensity discharge lamp in industry.

Strontium-90 is used as a tracer in the research on crops.

Cobalt-60 is used for food preservation.

Boron-10 is used in tumour detection.

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