During the synthesis of one molecule of glucose as net gain the number of `CO_(2)` molecules required and turns of Calvin cycle to be operated respectively are

Options

A. six and two
B. six and six
C. six and three
D. two and six

Answer

To determine the number of CO₂ molecules required and the number of turns of the Calvin cycle needed to synthesize one molecule of glucose (C₆H₁₂O₆), we can follow these steps:

### Step 1: Understand the Composition of Glucose
- Glucose has the chemical formula C₆H₁₂O₆, which indicates that one molecule of glucose contains 6 carbon atoms.

### Step 2: Determine the Role of the Calvin Cycle
- The Calvin cycle is responsible for fixing carbon dioxide (CO₂) into organic molecules. Each turn of the Calvin cycle fixes one carbon atom.

### Step 3: Calculate the Number of Turns Required
- Since one turn of the Calvin cycle fixes one carbon atom, to fix 6 carbon atoms (to form one glucose molecule), the Calvin cycle must turn 6 times.

### Step 4: Calculate the Number of CO₂ Molecules Required
- Each turn of the Calvin cycle requires one molecule of CO₂. Therefore, to perform 6 turns, the cycle will require 6 CO₂ molecules.

### Conclusion
- The synthesis of one molecule of glucose requires a net gain of 6 CO₂ molecules and 6 turns of the Calvin cycle.

### Final Answer
- The number of CO₂ molecules required: **6**
- The number of turns of the Calvin cycle: **6**

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