Answered

Radioisotopes can be used to help understand chemical and biological processes in plants, because:


They are stable and can be detected easily using a Geiger counter.

They are not harmful to the plants and animals they are used in.

They are used to trace the pathway of chemical reactions.

They are a natural byproduct of many biological processes.

Answer :

Radioisotopes can be used to help understand chemical and biological processes in plants. This is true for two reasons: 1) Radioisotopes are chemically identical with other isotopes of the same element and will be substituted in chemical reactions and 2) Radioactive forms of the element can be easily detected with a Geiger counter or other such device. 
The best and most correct answer among the choices provided by your question is the third choice or letter C.

Radioisotopes can be used to trace the pathways of chemical reactions.

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