Who gave the definite proof of life arising from pre-existing life?
(a) Redi
(b) Spallanzani
(c) Pasteur
(d) Cuvier

Options

A. Redi
B. Spallanzani
C. Pasteur
D. Cuvier

Answer

To solve the question "Who gave the definite proof of life arising from pre-existing life?", we can follow these steps:

### Step 1: Understand the Question
The question is asking for the scientist who provided conclusive evidence that life originates from existing life forms, rather than arising spontaneously.

### Step 2: Analyze the Options
We have four options to consider:
- (a) Redi
- (b) Spallanzani
- (c) Pasteur
- (d) Cuvier

### Step 3: Recall Historical Experiments
We need to recall the contributions of each scientist mentioned:
- **Redi**: Conducted experiments with meat and flies, disproving spontaneous generation but not providing definitive proof of life from pre-existing life.
- **Spallanzani**: Performed experiments with sealed flasks of broth, suggesting that microorganisms come from the air but did not fully prove life arises from pre-existing life.
- **Pasteur**: Conducted the famous swan-neck flask experiment, demonstrating that microorganisms in the air contaminate sterile solutions, thus proving that life arises from existing life.
- **Cuvier**: Known for his work in paleontology and comparative anatomy, but not related to the origin of life experiments.

### Step 4: Identify the Correct Answer
Based on the historical context and experiments:
- **Louis Pasteur** is the scientist who provided the definitive proof that life arises from pre-existing life through his experiments with flasks.

### Conclusion
The correct answer is (c) Pasteur.

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