Question

Which one of the following nutrient elements remains in ionic form and is the main cation in establishing plant cell turgor?

• A. Potassium
• B. Phosphorus
• C. Boron
• D. Sulfur

Hint:

Potassium (K+): Main cation for osmoregulation.
Maintains turgor and stomatal opening.
Most abundant cation in plant cells.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
This question tests knowledge of plant nutrient functions.

Step 2: Detailed Explanation:
Potassium (K+) remains in ionic form and is the main cation in establishing plant cell turgor.
K+ is the most abundant cation in plant cells.
It regulates:
- Osmotic potential (turgor pressure).
- Stomatal movement.
- Enzyme activation.
Phosphorus (B): Present as phosphate (HPO4²⁻, H2PO4⁻).
Boron (C): Present as boric acid (not a cation).
Sulfur (D): Present as sulfate (SO4²⁻).
Thus, potassium is the main cation for turgor.

Step 3: Final Answer:
Thus, potassium is the main cation in establishing turgor, which corresponds to option (A).
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