The Question is from neet-botany mineral-nutrition essential-elements, and it was created by the author Mr. NARESH KUMAR K

Question

Which ion is actively transported into guard cells to facilitate stomatal opening, indirectly contributing to turgor maintenance in surrounding cells?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B. Potassium ($K^+$)
## CONCEPT FRAMEWORK
 **Primary Concept**: Stomatal opening and its relation to turgor pressure.
 **Related Topics**: Guard cells, osmosis, ion transport, transpiration.
 **Prerequisites**: Understanding of stomatal function and its mechanism.
## SOLUTION PATHWAY
**Given Information**:
	The question asks which ion is actively transported into guard cells to open stomata and indirectly maintain turgor in surrounding cells.
**Method & Steps**:
	1. Stomatal opening: Stomata open when guard cells become turgid due to water influx.
	2. Potassium's role: Potassium ($K^+$) ions are actively pumped into guard cells, lowering their water potential. This causes water to enter the guard cells via osmosis, making them turgid and opening the stomata.
	3. Indirect effect on turgor: Increased water uptake by guard cells can indirectly contribute to the turgor pressure of surrounding mesophyll cells.
	Result: Potassium ($K^+$) is actively transported into guard cells to facilitate stomatal opening and indirectly maintain turgor.
	Verification: This is a well-established mechanism of stomatal regulation.
## OPTION ANALYSIS
A :x: Sodium ($Na^+$) is not the primary ion involved in stomatal opening.
B ✓: Potassium ($K^+$) is actively transported into guard cells to induce turgor and open stomata.
C :x: Calcium ($Ca^{2+}$) plays a role in signaling pathways but not the primary ion for stomatal opening.
D :x: Chloride ($Cl^-$) may be involved in some stomatal regulation, but potassium is the primary ion.
## LEARNING AIDS
 **Common Mistakes**: Confusing the roles of different ions in stomatal regulation.
 **Quick Tips**: Remember the key role of potassium in guard cell turgor and stomatal opening.

Mr. NARESH KUMAR K · Answer

Sodium ($Na^+$)

Mr. NARESH KUMAR K · Answer

The correct Option is "Potassium ($K^+$)"

Mr. NARESH KUMAR K · Answer

Calcium ($Ca^{2+}$)

Mr. NARESH KUMAR K · Answer

Chloride ($Cl^-$)

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