The full form of ICBN is the International Code for Botanical Nomenclature. It is the set of rules and recommendations for naming plants, algae, and fungi. The aim of the ICBN is to ensure that each organism has a unique and stable name that is recognized internationally.

History of ICBN:

- The first edition of the ICBN was published in 1906.
- It was revised several times, with the latest edition being the 2012 Vienna Code.
- The ICBN is maintained by the International Association for Plant Taxonomy (IAPT).

Rules of ICBN:

- The ICBN lays down rules for the formation and use of names for plants, algae, and fungi. It provides guidelines for naming new taxa, for the recognition of names that have already been published, and for the correction of errors.
- The ICBN also provides guidelines for the citation of names, for the use of ranks, and for the establishment of type specimens.
- It lays down rules for the use of diacritical marks, accents, and special characters in names.

Importance of ICBN:

- The ICBN is important because it provides a standardized system for naming plants, algae, and fungi.
- It ensures that each organism has a unique and stable name that is recognized internationally.
- The ICBN helps to avoid confusion and ambiguity in the naming of plants, algae, and fungi.
- It also helps to ensure that the names of plants, algae, and fungi are stable and do not change unnecessarily.

Conclusion:

The ICBN is an important set of rules and recommendations for naming plants, algae, and fungi. It provides a standardized system for naming these organisms, ensuring that each organism has a unique and stable name that is recognized internationally. The ICBN helps to avoid confusion and ambiguity in the naming of plants, algae, and fungi, and helps to ensure that the names of these organisms are stable and do not change unnecessarily.

Answer ( A )
*) ICBN stands for International Code for Botanical Nomenclature that frames rules for the nomenclature of plants over the world.