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Hugo de Vries formulated the "Mutation T...

Hugo de Vries formulated the "Mutation Theory" based on the experiments he conducted on

A

Althea rosea

B

Pisum sativum

C

Drosophila melanogaster

D

Oenothera lamarckiana

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To solve the question regarding Hugo de Vries and the "Mutation Theory," we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Question**: The question asks about the organism on which Hugo de Vries based his "Mutation Theory." 2. **Identifying the Options**: The options provided are: - Option 1: Althea rosea - Option 2: Spicum sativum - Option 3: Drosophila melanogaster - Option 4: Oinothera lamarckiana 3. **Recalling Hugo de Vries' Work**: Hugo de Vries was a botanist who is best known for his work on the concept of mutation. He conducted experiments to understand how variations occur in organisms. 4. **Identifying the Correct Organism**: - Hugo de Vries conducted his experiments primarily on the plant **Oinothera lamarckiana**, commonly known as the Evening Primrose. - He observed that this plant exhibited sudden and distinct variations, which led him to propose that these variations were due to mutations. 5. **Conclusion**: Based on the experiments conducted by Hugo de Vries, the correct answer to the question is **Option 4: Oinothera lamarckiana**. ### Final Answer: **Oinothera lamarckiana** ---
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