In photosynthesis , for synthesis of one mole of glucose number of ATP and `NADPH_(2)` required is

Options

A. 12 and 18
B. 18 and 12
C. 6 and 12
D. 18 and 18

Answer

To determine the number of ATP and NADPH required for the synthesis of one mole of glucose during photosynthesis, we can break down the process into steps:

### Step-by-Step Solution:

1. **Understanding Photosynthesis**: Photosynthesis occurs in two main stages: the light reactions and the dark reactions (Calvin cycle). The light reactions capture energy from sunlight and convert it into chemical energy in the form of ATP and NADPH.

2. **Light Reactions**: During the light reactions, ATP and NADPH are produced. These molecules are essential for the subsequent dark reactions where glucose is synthesized.

3. **Calvin Cycle**: In the Calvin cycle, carbon dioxide is fixed to produce glucose. To fix one molecule of carbon dioxide, the cycle requires:
- 3 ATP molecules
- 2 NADPH molecules

4. **Calculating for Glucose**: Glucose (C6H12O6) is a hexose sugar, meaning it contains 6 carbon atoms. To synthesize one mole of glucose, we need to fix 6 molecules of carbon dioxide.

5. **Total Requirements**:
- For 6 molecules of CO2:
- ATP required = 6 CO2 x 3 ATP/CO2 = 18 ATP
- NADPH required = 6 CO2 x 2 NADPH/CO2 = 12 NADPH

6. **Conclusion**: Therefore, to synthesize one mole of glucose, the total requirements are:
- **18 ATP**
- **12 NADPH**

### Final Answer:
For the synthesis of one mole of glucose, the number of ATP required is **18** and the number of NADPH required is **12**.

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