`CO_(2) NADPH_(2)` ATP ratio in `C_(4)` plants is

Options

A. 123
B. 124
C. 136
D. 125

Answer

To determine the CO₂ : NADPH₂ : ATP ratio in C₄ plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the C₄ Pathway**:
- C₄ plants utilize the Hatch and Slack pathway for photosynthesis. This pathway is efficient in capturing CO₂ and converting it into sugars.

2. **Identifying the Products**:
- In one cycle of the Hatch and Slack pathway, the following products are generated:
- **CO₂**: 6 molecules
- **NADPH₂**: 12 molecules
- **ATP**: 30 molecules

3. **Setting Up the Ratio**:
- We need to express the ratio of CO₂ : NADPH₂ : ATP based on the quantities obtained:
- CO₂ = 6
- NADPH₂ = 12
- ATP = 30

4. **Writing the Ratio**:
- The initial ratio can be written as:
- CO₂ : NADPH₂ : ATP = 6 : 12 : 30

5. **Simplifying the Ratio**:
- To simplify the ratio, we can divide each term by the greatest common divisor. In this case, we can divide each term by 6:
- CO₂ : NADPH₂ : ATP = 6/6 : 12/6 : 30/6
- This simplifies to:
- CO₂ : NADPH₂ : ATP = 1 : 2 : 5

6. **Final Answer**:
- Therefore, the CO₂ : NADPH₂ : ATP ratio in C₄ plants is **1 : 2 : 5**.