The Question is from neet-botany photosynthesis-in-higher-plants , and it was created by the author K SURESH KUMAR

Question

Which of the following is NOT a characteristic of C4 plants?

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Photosynthesis in C4 plants
 **Related Topics**: C3 photosynthesis, Kranz anatomy, PEP carboxylase, CO2 compensation point
 **Prerequisites**: Basic understanding of photosynthesis and plant anatomy.
## SOLUTION PATHWAY
**Given Information**:
  The question asks to identify a characteristic that is NOT found in C4 plants.
  Options: High CO2 compensation point, Kranz anatomy, Presence of PEP carboxylase, Dimorphic chloroplasts
**Method & Steps**:
 1. Analyze each option to determine if it is a characteristic of C4 plants.
  Reasoning: C4 plants have evolved mechanisms to overcome photorespiration, a process that reduces the efficiency of photosynthesis in C3 plants.  These mechanisms involve spatial separation of carbon fixation steps.
 2. Identify the option that does not align with the characteristics of C4 plants.
  Working: Let's examine each option:
        * **High CO2 compensation point:** C4 plants have a low CO2 compensation point because they minimize photorespiration.
        * **Kranz anatomy:** This is a defining feature of C4 plants, involving specialized leaf anatomy with bundle sheath cells.
        * **Presence of PEP carboxylase:** This enzyme is crucial for the initial carbon fixation step in C4 plants.
        * **Dimorphic chloroplasts:** C4 plants possess two types of chloroplasts: those in mesophyll cells and those in bundle sheath cells, which differ in structure and function.
 3. Determine the option that is NOT a characteristic of C4 plants.
  Result: A high CO2 compensation point is NOT a characteristic of C4 plants; they have a low CO2 compensation point.
  Verification: The low CO2 compensation point is a direct consequence of the C4 pathway's efficiency in minimizing photorespiration.
 ## OPTION ANALYSIS
A ✓: High CO2 compensation point:  C4 plants have a low CO2 compensation point because of their efficient CO2 concentrating mechanism.  This is the correct answer.
B :x: Kranz anatomy: This is a characteristic of C4 plants.
C :x: Presence of PEP carboxylase: This enzyme is essential for the initial carbon fixation step in C4 plants.
D :x: Dimorphic chloroplasts:  C4 plants have chloroplasts in both mesophyll and bundle sheath cells, differing in structure and function.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing C3 and C4 characteristics: Carefully review the defining features of each photosynthetic pathway.
  2.Misunderstanding the role of PEP carboxylase: Remember that PEP carboxylase is key to the initial carbon fixation in C4 plants.
 **Quick Tips**:
  1.Remember the low CO2 compensation point as a key feature of C4 plants.
  2.Associate Kranz anatomy and dimorphic chloroplasts with C4 photosynthesis.

K SURESH KUMAR · Answer

The correct Option is "High CO2 compensation point"

K SURESH KUMAR · Answer

Kranz anatomy

K SURESH KUMAR · Answer

Presence of PEP carboxylase

K SURESH KUMAR · Answer

Dimorphic chloroplasts

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