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B, CI and Ni are:...

B, CI and Ni are:

A

The most essential elements

B

Macronutrients

C

Trace elements

D

Present in plant tissues in very large amounts

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The correct Answer is:
**Step-by-Step Solution:** 1. **Identify the Elements**: The elements in question are Boron (B), Chlorine (Cl), and Nickel (Ni). 2. **Categorize the Elements**: Determine whether these elements are macronutrients or micronutrients. Macronutrients are required in large amounts by plants, while micronutrients are needed in smaller amounts. 3. **Research the Role of Each Element**: - **Boron (B)**: This is classified as a micronutrient. It plays a crucial role in cell wall formation and reproductive growth. - **Chlorine (Cl)**: Also a micronutrient, chlorine is important for photosynthesis and osmosis. - **Nickel (Ni)**: Nickel is another micronutrient, essential for the functioning of certain enzymes and nitrogen metabolism. 4. **Conclusion**: Since Boron, Chlorine, and Nickel are all classified as micronutrients, they are required by plants in trace amounts rather than large amounts. 5. **Final Answer**: B, Cl, and Ni are micronutrients (trace elements) essential for plant growth but required in small amounts. ---
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