In `C_(3)` plants, the first stable product of photosynthesis during dark reaction is

Options

A. Phosphoglyceraldehyde PGL
B. Malic acid
C. Oxaloacetic acid
D. 3-Phosphoglyceric acid

Answer

To answer the question, "In C3 plants, the first stable product of photosynthesis during the dark reaction is," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process**:
- Photosynthesis consists of two main stages: light reactions and dark reactions (Calvin cycle). The dark reaction does not require light and can occur during the day or night.

2. **Identify the Dark Reaction**:
- The dark reaction is also known as the Calvin cycle or C3 cycle. It is responsible for converting carbon dioxide into organic compounds.

3. **Recognize the First Stable Product**:
- During the Calvin cycle, carbon dioxide is fixed and combined with a 5-carbon sugar (ribulose bisphosphate, RuBP) to form an unstable 6-carbon intermediate. This intermediate quickly splits into two molecules of 3-phosphoglyceric acid (3-PGA).

4. **Determine the Characteristics of the Product**:
- 3-phosphoglyceric acid (3-PGA) is a 3-carbon compound, which is why this cycle is referred to as the C3 cycle.

5. **Conclude the Answer**:
- Therefore, the first stable product of photosynthesis during the dark reaction in C3 plants is 3-phosphoglyceric acid (3-PGA).

### Final Answer:
In C3 plants, the first stable product of photosynthesis during the dark reaction is 3-phosphoglyceric acid (3-PGA).