The Question is from neet-botany anatomy-of-flowering-plants , and it was created by the author Mr. NARESH KUMAR K

Question

Which cells regulate the opening and closing of stomata in a dicot leaf?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Plant anatomy and physiology, specifically stomatal function.
 **Related Topics**: Transpiration, gas exchange, turgor pressure.
 **Prerequisites**: Basic understanding of plant cell types and their functions.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the cells responsible for regulating stomata in a dicot leaf.
  The options are different types of plant cells.
**Method & Steps**:
 1. Identify the function of stomata: Stomata are tiny pores on the leaf surface that regulate gas exchange (CO2 intake and O2 release) and transpiration (water loss).
  Reasoning:  The opening and closing of stomata is crucial for controlling these processes.
  Formula/Rule: None directly applicable.
 2. Identify the cells controlling stomatal opening and closing: Guard cells are specialized epidermal cells that surround each stoma. Their shape change, driven by turgor pressure, controls the size of the stomatal pore.
  Working:  Guard cells swell (become turgid) to open the stoma and shrink (become flaccid) to close it.  Other cell types in the leaf do not directly control stomatal aperture.
  Key Point: Turgor pressure changes in guard cells are influenced by factors like light intensity, CO2 concentration, and water availability.
 3. Select the correct option: Guard cells are the cells that directly regulate stomatal opening and closing.
  Result: Guard cells (option C).
  Verification:  The function of guard cells aligns perfectly with the question's description of stomatal regulation.
 ## OPTION ANALYSIS
[A] :x: Epidermal cells are the outermost layer of cells in the leaf, but not all epidermal cells regulate stomata.  Guard cells are a specialized type of epidermal cell.
[B] :x: Palisade cells are photosynthetic cells located beneath the epidermis; they don't directly control stomata.
[C] ✓: Guard cells are specialized epidermal cells surrounding stomata, directly responsible for their opening and closing.
[D] :x: Mesophyll cells are the internal cells of the leaf involved in photosynthesis; they do not directly regulate stomata.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing epidermal cells with guard cells: Remember that guard cells are a specific type of epidermal cell.
  How to avoid: Understand the specialized function of guard cells in regulating stomatal aperture.
  2.Selecting cells involved in photosynthesis (palisade or mesophyll) instead of those involved in gas exchange regulation:
  How to avoid: Focus on the process of stomatal opening and closing and the cells directly involved.
 **Quick Tips**:
  1.Remember the location and function of guard cells: They are found in pairs surrounding stomata and control their opening and closing.
  2.Associate guard cells with turgor pressure changes and stomatal regulation.

Mr. NARESH KUMAR K · Answer

Epidermal cells

Mr. NARESH KUMAR K · Answer

Palisade cells

Mr. NARESH KUMAR K · Answer

The correct Option is "Guard cells"

Mr. NARESH KUMAR K · Answer

Mesophyll cells

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