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Tracer elements are...

Tracer elements are

A

microelements

B

macroelements

C

radioisotopes

D

vitamins

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Tracer Elements**: Tracer elements, also known as micronutrients, are essential elements that plants require in very small quantities. They play crucial roles in various physiological processes. 2. **Identifying the Options**: The question provides four options: - a. microelements - b. macroelements - c. radioisotopes - d. vitamins 3. **Analyzing Each Option**: - **Microelements**: These are elements required in trace amounts (less than 10 millimoles per kg of dry matter), which aligns with the definition of tracer elements. - **Macroelements**: These are required in larger quantities and do not fit the definition of tracer elements. - **Radioisotopes**: These are unstable isotopes that emit radiation and are not related to plant nutrition in the context of essential nutrients. - **Vitamins**: While important for various biological functions, they are not classified as mineral nutrients and do not fit the definition of tracer elements. 4. **Conclusion**: Based on the analysis, the correct answer is option A, microelements, as they are synonymous with tracer elements in the context of plant nutrition. **Final Answer**: a. microelements ---
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