The tracer elements are

Vitamins.

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Radioisotopes.

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Microelements.

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Macroelements.

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Solution

The correct option is A Radioisotopes.
Tracer elements are widely used in biological research and various diagnostic techniques. Tracer elements are radioactive isotopes that function like normal elements but emit radiations. They can therefore be located by Geiger Muller counter or a scintillation counter and autoradiography. These are used to detect various metabolic pathways in plants e.g., C14,N15,P32,S35 etc.
So, the correct option is B.

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Similar questions

Match the following:

\begin{matrix} Column I & Column II a. Number of elements found in plants & 1. 8 b. Number of essential elements & 2. 100 c. Number of macroelements & 3. > 60 d. Number of microelements & 4. 17 e. Number of non-essential elements & 5. 9 6. > 17 \end{matrix}

Match the following:

Column I	Column II
a. Number of elements found in plants	1. 8
b. Number of essential elements	2. 100
c. Number of macroelements	3. >60
d. Number of microelements	4. 17
e. Number of non-essential elements	5. 9
	6. >17

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