Binomial nomenclature was popularised by

Options

A. Linnaeus
B. Darwin
C. Haeckel
D. John ray

Answer

### Step-by-Step Solution:

1. **Understanding Binomial Nomenclature**:
- Binomial nomenclature is a system for naming organisms. It consists of two parts: the first part is the genus name, and the second part is the species identifier. This system allows for a universal naming convention for species.

2. **Identifying the Originator**:
- The question asks who popularized binomial nomenclature. The key figure associated with this system is Carl Linnaeus, a Swedish botanist.

3. **Examples of Binomial Nomenclature**:
- For instance, in humans, the binomial nomenclature is "Homo sapiens," where "Homo" is the genus and "sapiens" is the species.

4. **Evaluating the Options**:
- The options provided are:
- A) Linnaeus
- B) Darwin
- C) Haeckel
- D) Jena
- Among these, Linnaeus is the correct answer as he is credited with developing and popularizing the binomial nomenclature system.

5. **Eliminating Incorrect Options**:
- Darwin is known for his theory of natural selection, not for binomial nomenclature.
- Ernst Haeckel is known for his biogenetic law, which is unrelated to nomenclature.
- The option "Jena" does not relate to binomial nomenclature either, as he contributed to species definitions.

6. **Conclusion**:
- The correct answer to the question is **A) Linnaeus**.