Biogenesis was proposed by Francesco Redi and supported by

Options

A. Thales and Plato
B. Spallanzani and Pasteur
C. Thomson and Helmholtz
D. Oparin and Haldane

Answer

**Step-by-Step Solution:**

1. **Understanding Biogenesis**: Biogenesis is the theory that living organisms arise from pre-existing life, as opposed to spontaneous generation, which suggests that life can arise from non-living matter.

2. **Francesco Redi's Contribution**: Francesco Redi was the first to propose the concept of biogenesis. He conducted experiments in the 17th century that demonstrated that maggots on decaying meat came from eggs laid by flies, not spontaneously from the meat itself.

3. **Support for Biogenesis**: The theory of biogenesis was significantly supported by Louis Pasteur in the 19th century. Pasteur conducted experiments that showed that microorganisms come from other microorganisms, not from non-living matter. He famously used swan-neck flasks to demonstrate that sterilized broth remained free of microorganisms unless exposed to air.

4. **Additional Support**: The theory was also supported by the work of Spallanzani, who performed experiments with boiled broth in sealed and unsealed flasks. His results showed that only the unsealed flasks became contaminated with microorganisms, reinforcing the idea that life comes from existing life.

5. **Conclusion**: Therefore, the correct answer to the question is that biogenesis was proposed by Francesco Redi and supported by Louis Pasteur and Spallanzani.

**Final Answer**: Biogenesis was proposed by Francesco Redi and supported by Louis Pasteur and Spallanzani.

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