The Question is from neet-botany photosynthesis-in-higher-plants , and it was created by the author D VINOD

Question

Which of the following metabolites is transported from mesophyll cells to bundle sheath cells in C4 plants during active photosynthesis?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: C4 photosynthesis
 **Related Topics**: Carbon fixation, Kranz anatomy, metabolic pathways
 **Prerequisites**: Understanding of photosynthesis, cellular respiration, and metabolic pathways.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the metabolite transported from mesophyll cells to bundle sheath cells in C4 plants during photosynthesis.
  C4 plants have a specialized leaf anatomy called Kranz anatomy.
**Method & Steps**:
 1. Understand the C4 pathway.
  Reasoning: C4 plants utilize a two-stage carbon fixation process to enhance photosynthetic efficiency in hot, dry climates.
  Formula/Rule:  No specific formula is required here, but understanding the steps of C4 photosynthesis is crucial.
 2. Identify the metabolite transported.
  Working: In C4 plants, CO2 is initially fixed in mesophyll cells by the enzyme PEP carboxylase, forming oxaloacetate. Oxaloacetate is then converted to malate or aspartate, which are transported to the bundle sheath cells.
  Key Point: The transport of these four-carbon compounds (malate or aspartate) is a key characteristic of C4 photosynthesis.
 3. Select the correct option.
  Result: Malate or aspartate are transported from mesophyll cells to bundle sheath cells.
  Verification: This aligns with the established understanding of the C4 photosynthetic pathway.
 ## OPTION ANALYSIS
[A] :x: 3-Phosphoglycerate (3-PGA) is a product of the Calvin cycle, which occurs in the bundle sheath cells in C4 plants. It is not transported from the mesophyll cells.
[B] :x: Glyceraldehyde 3-phosphate (G3P) is also an intermediate of the Calvin cycle within the bundle sheath cells, not transported from the mesophyll cells.
[C] :x: Pyruvate is involved in the C4 cycle, but it's primarily in the mesophyll cells and is not the main transported metabolite.
[D] ✓: Malate or aspartate are the four-carbon compounds that carry the fixed carbon dioxide from the mesophyll cells to the bundle sheath cells for further processing in the Calvin cycle.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the roles of mesophyll and bundle sheath cells: Understanding the spatial separation of the initial carbon fixation and the Calvin cycle is key.
  2. Focusing on the products of the Calvin cycle instead of the transported metabolite: The question specifically asks about the transported metabolite, not the products of the cycle.
 **Quick Tips**:
  1.Remember the key function of the C4 pathway: efficient CO2 concentration.
  2.Associate malate and aspartate with the C4 pathway's transport mechanism.

D VINOD · Answer

3-Phosphoglycerate (3-PGA)

D VINOD · Answer

Glyceraldehyde 3-phosphate (G3P)

D VINOD · Answer

Pyruvate

D VINOD · Answer

The correct Option is "Malate or aspartate"

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