Which among the following cannot be a feature of micronutrient?

Options

A. Maintain ribosome structure
B. Activator or catalase, aconitase
C. Activator of nitrogenase
D. Pollen germination

Answer

To solve the question "Which among the following cannot be a feature of micronutrient?", we need to analyze the options provided and determine which one does not fit the characteristics of micronutrients.

### Step-by-Step Solution:

1. **Understand Micronutrients**: Micronutrients are essential elements required by organisms in small quantities for proper physiological functions. They include vitamins and minerals that play crucial roles in various biochemical processes.

2. **Review the Options**: The options provided in the question likely include various functions or characteristics associated with micronutrients. We need to evaluate each option to identify which one does not belong.

3. **Evaluate the First Option**: The first option mentions "Maintain ribosome structure". Ribosomes are cellular structures responsible for protein synthesis, and they require macronutrients like potassium for their structural integrity. Since potassium is classified as a macronutrient, this option does not represent a feature of micronutrients.

4. **Evaluate the Second Option**: The second option refers to "activator and catalase are Echinitis". Calcium is mentioned as an activator of catalase, which is a micronutrient. This option aligns with the characteristics of micronutrients.

5. **Evaluate the Third Option**: The third option discusses the activator of nitrogen, which includes magnesium and manganese ions. Both of these are known micronutrients and play essential roles in various biological processes.

6. **Conclusion**: After evaluating all the options, it is clear that the first option, "Maintain ribosome structure", is the only one that does not represent a feature of micronutrients. Therefore, we can conclude that this option is the correct answer.

### Final Answer:
The feature that cannot be associated with micronutrients is: **Maintain ribosome structure**.