A) Micro elements
B) Macro-elements
C) Radio isotopes
D) Vitamins
Correct Answer: C
Solution :
Tracer elements are radioactive isotopes of elements, which are used to detect various metabolic pathways in plants e.g., \[{{C}^{14}},\,{{N}^{15}},\,{{P}^{32}},\,{{S}^{35}}\] etc.
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