Identify A, B, and C in the given Hatch and Slack pathway diagram:
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The efficiency of the C4 pathway in minimizing photorespiration is pivotal in conserving water and energy in plants, making it a key adaptation in arid climates.
A – Fixation, B – Regeneration, C – Decarboxylation
A – Regeneration, B – Fixation, C – Decarboxylation
A – Decarboxylation, B – Regeneration, C – Fixation
A – Fixation, B – Decarboxylation, C – Regeneration
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The Correct Option isD
Approach Solution - 1
Step 1: Analyzing the Hatch and Slack pathway components. The diagram illustrates the C4 photosynthesis pathway which efficiently captures carbon in hot and dry environments. A, located in the mesophyll cells, represents Fixation, where atmospheric CO2 is initially fixed into a four-carbon compound (e.g., oxaloacetate) by the enzyme PEP carboxylase. Step 2: Understanding Decarboxylation and Regeneration. B in the diagram, occurring in the bundle sheath cells, involves Decarboxylation where the four-carbon compound releases CO2 to be used in the Calvin cycle. C represents Regeneration, where the remaining three-carbon compound (e.g., pyruvate) returns to the mesophyll cells to regenerate phosphoenol pyruvate (PEP), thus completing the cycle.
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Approach Solution -2
To solve the problem, we need to identify the correct sequence of processes (A, B, and C) in the given Hatch and Slack pathway of photosynthesis.
1. Understanding the Hatch and Slack Pathway: The Hatch and Slack pathway is a method of photosynthesis in C4 plants. The pathway involves three main stages:
Fixation: This is where carbon dioxide is initially fixed into a 4-carbon compound by the enzyme PEP carboxylase.
Decarboxylation: The 4-carbon compound is decarboxylated to release carbon dioxide, which is used in the Calvin cycle.
Regeneration: The remaining 3-carbon compound is regenerated to continue the cycle.
2. Analyzing the Processes: From the diagram, we can see the following:
A: Fixation: Carbon dioxide is fixed into a 4-carbon compound.
B: Regeneration: The 3-carbon compound is regenerated to continue the cycle.
C: Decarboxylation: The 4-carbon compound undergoes decarboxylation to release CO2 for the Calvin cycle.
3. Analyzing the Correct Sequence: The correct sequence of the steps in the Hatch and Slack pathway is: A = Fixation B = Regeneration C = Decarboxylation
Final Answer: The correct option is (D) A = Fixation, B = Decarboxylation, C = Regeneration.
