Which of the following combinations correctly matches the ion, its role in plants, and a typical mechanism of its uptake?\n(A) Calcium - Cell wall component - Symport with protons\n(B) Potassium - Stomatal regulation - Channel proteins\n(C) Nitrate - Nucleic acid synthesis - Active transport through ATPases\n(D) Magnesium - Chlorophyll constituent - Passive diffusion

## CORE INFORMATION\n✓ **Answer**: B\n## CONCEPT FRAMEWORK\n **Primary Concept**: Plant ion uptake mechanisms\n **Related Topics**: Plant nutrition, membrane transport, ion channels, active transport, passive transport\n **Prerequisites**: Understanding of plant physiology, basic biochemistry, and membrane transport processes.\n## SOLUTION PATHWAY\n**Given Information**:\nFour options, each stating an ion, its role in plants, and its uptake mechanism.\n**Method & Steps**:\n1. Analyze each option individually to determine its accuracy.\n Reasoning: Evaluate the correctness of the ion's role and the mechanism of uptake.\n Formula/Rule: No specific formula is required; the solution relies on biological knowledge.\n2. Identify the option with the correct combination of ion, role, and uptake mechanism.\n Working: \n * Option A: Calcium is a component of the cell wall, but its uptake primarily involves symport with protons. This statement is largely correct.\n * Option B: Potassium plays a crucial role in stomatal regulation, and its uptake predominantly occurs through channel proteins. This statement is correct.\n * Option C: Nitrate is essential for nucleic acid synthesis, but its uptake typically involves active transport, often through nitrate transporters, not solely ATPases. This statement is partially correct but lacks precision.\n * Option D: Magnesium is a constituent of chlorophyll, but its uptake is not simply passive diffusion; it also involves active transport mechanisms. This statement is incorrect.\n Key Point: The question asks for a *correct* match, not just a partially correct one. The mechanism of uptake must be the primary mechanism.\n3. Determine the most accurate option.\n Result: Option B is the most accurate, as both the role of potassium and its primary uptake mechanism are correctly stated.\n Verification: Review the biological roles of the ions and their known transport mechanisms in plants.\n## OPTION ANALYSIS\nA :x: While Calcium is a cell wall component and symport with protons is a mechanism of uptake, it's not the only or primary mechanism. Therefore, this option is not completely accurate.\nB ✓: Potassium is vital for stomatal regulation, and channel proteins are the primary mechanism for its uptake. This is the correct option.\nC :x: While nitrate is used in nucleic acid synthesis and active transport is involved, specifying ATPases is an oversimplification. Nitrate transporters are more accurate.\nD :x: Magnesium is crucial for chlorophyll, but its uptake isn't solely passive diffusion; active transport is also involved.\n## LEARNING AIDS\n **Common Mistakes**:\n 1. Oversimplifying the ion uptake mechanisms: Many ions utilize multiple transport mechanisms. \n 2. Confusing the primary role of an ion with a secondary role.\n **Quick Tips**:\n 1. Familiarize yourself with the major roles of essential plant nutrients.\n 2. Understand the different types of membrane transport (passive, active, symport, antiport, etc.).

NEET Botany Mineral Nutrition MCQs

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NEET Questions / Botany / Mineral Nutrition