Match the list of items column I with Column II
`{:("Column-I","Column-II"),("Scientist","Contribution"),("Mitchell","Law of limiting Factor"),("Blackman","Dark reaction"),("Arnon","Photophosphorylation"),("Calvin","Chemiosmotic theory"):}`

Options

A. A-1,,B-2,C-3,D-4
B. A-4,B-1,C-3,D-2
C. A-2,B-1,C-4,D-3
D. A-4,B-3,C-2,D-1

Answer

To match the items in Column I with Column II, we need to identify the contributions of each scientist listed in Column I and then find the corresponding contribution in Column II.

### Step-by-Step Solution:

1. **Identify the Contribution of Mitchell**:
- Mitchell's full name is Peter Mitchell. He is known for the **Chemiosmotic Theory**, which explains how ATP is synthesized in the mitochondria and chloroplasts through a proton gradient.
- **Match**: Mitchell → Chemiosmotic Theory (Column II: 4)

2. **Identify the Contribution of Blackman**:
- Blackman is known for the **Law of Limiting Factors** in photosynthesis. This law states that the rate of photosynthesis is limited by the factor that is in the shortest supply.
- **Match**: Blackman → Law of Limiting Factors (Column II: 1)

3. **Identify the Contribution of Arnon**:
- Arnon is recognized for discovering **Photophosphorylation**, a process that involves the synthesis of ATP and NADPH during photosynthesis.
- **Match**: Arnon → Photophosphorylation (Column II: 3)

4. **Identify the Contribution of Calvin**:
- Calvin is known for the **Dark Reaction** of photosynthesis, which is also referred to as the Calvin Cycle. This cycle involves the fixation of carbon dioxide and the production of glucose.
- **Match**: Calvin → Dark Reaction (Column II: 2)

### Final Matches:
- Mitchell → Chemiosmotic Theory (4)
- Blackman → Law of Limiting Factors (1)
- Arnon → Photophosphorylation (3)
- Calvin → Dark Reaction (2)

### Summary of Matches:
- Mitchell - 4
- Blackman - 1
- Arnon - 3
- Calvin - 2