Number of triose molecules from G - 3P pool that enter into cytosol from chloroplast to form the main end product of `C_3` cycle which is transported through phloem.

Options

A. 2
B. 10
C. 4
D. 6

Answer

To solve the question regarding the number of triose molecules from the G3P pool that enter the cytosol from the chloroplast to form the main end product of the C3 cycle, we can break down the process step by step.

### Step-by-Step Solution:

1. **Understanding the C3 Cycle (Calvin Cycle)**:
- The C3 cycle, also known as the Calvin cycle, is the process by which plants convert carbon dioxide into glucose using the energy from sunlight.

2. **Formation of G3P**:
- During the Calvin cycle, for every three molecules of carbon dioxide (CO2) that enter the cycle, six molecules of glyceraldehyde 3-phosphate (G3P), also known as triose phosphate, are produced.

3. **Utilization of G3P**:
- Out of the six G3P molecules produced, one G3P molecule is used to form glucose and other carbohydrates. The remaining five G3P molecules are recycled to regenerate ribulose bisphosphate (RuBP), which is necessary for the continuation of the cycle.

4. **Transport to Cytosol**:
- The question specifically asks how many triose molecules enter the cytosol from the chloroplast. In this case, it is the one G3P molecule that is used for glucose synthesis that is transported out of the chloroplast into the cytosol.

5. **Final Count**:
- Therefore, the number of triose molecules (G3P) that enter the cytosol from the chloroplast to form the main end product of the C3 cycle is **1**.

### Conclusion:
The correct answer is **1** triose molecule (G3P) that enters the cytosol from the chloroplast.