The first stable compound formed in photosynthesis of `C_(3)` plants is

Options

A. Phosphoglyceric acid
B. Starch
C. Pyruvic acid
D. Ribulose diphosphate

Answer

To answer the question "The first stable compound formed in photosynthesis of C3 plants is," we can follow these steps:

### Step 1: Understand the Photosynthesis Process in C3 Plants
C3 plants utilize a specific pathway for photosynthesis known as the Calvin cycle. This process involves carbon fixation, where carbon dioxide is converted into organic compounds.

**Hint:** Focus on the process of carbon fixation in C3 plants and the role of specific enzymes.

### Step 2: Identify the Key Enzyme
In C3 plants, the enzyme responsible for the first step of carbon fixation is called Rubisco (Ribulose-1,5-bisphosphate carboxylase/oxygenase). This enzyme catalyzes the reaction between carbon dioxide and ribulose bisphosphate (RuBP).

**Hint:** Remember the name and function of the enzyme involved in the initial step of carbon fixation.

### Step 3: Determine the First Stable Compound
The reaction catalyzed by Rubisco produces a 3-carbon compound. The first stable product formed during this process is 3-phosphoglyceric acid (3-PGA). This is why C3 plants are named so, as they produce a 3-carbon compound during photosynthesis.

**Hint:** Recall the significance of the number of carbon atoms in the first stable compound formed in C3 photosynthesis.

### Step 4: Conclusion
Thus, the first stable compound formed in the photosynthesis of C3 plants is phosphoglyceric acid (3-PGA).

**Final Answer:** The first stable compound formed in photosynthesis of C3 plants is **phosphoglyceric acid (3-PGA)**.