`C_(4)` plants consume _____ NADPH molecules to fix `2CO_(2)` , and `C_(3)` plants requires _____ molecules of NADPH for same amount of `2CO_(2)`

Options

A. 8,8
B. 4,4
C. 8,12
D. 12,8

Answer

To solve the question regarding the consumption of NADPH molecules by C4 and C3 plants for fixing 2 molecules of CO2, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding C3 Plant Requirements**:
- C3 plants require 2 NADPH molecules to fix 1 molecule of CO2.
- Therefore, to fix 2 molecules of CO2, C3 plants will need:
\[ 2 \text{ NADPH} \times 2 = 4 \text{ NADPH} \]

2. **Understanding C4 Plant Requirements**:
- C4 plants require 2 NADPH molecules to fix 1 molecule of CO2.
- Thus, for fixing 2 molecules of CO2, C4 plants will also need:
\[ 2 \text{ NADPH} \times 2 = 4 \text{ NADPH} \]

3. **Final Answer**:
- C4 plants consume **4 NADPH** molecules to fix 2 CO2.
- C3 plants also require **4 NADPH** molecules for the same amount of CO2.

### Summary:
- C4 plants consume **4 NADPH** for 2 CO2.
- C3 plants also require **4 NADPH** for 2 CO2.