Question

What is the 4th and 5th rule of ICBN?????

Answer 1

rule 4.In the absence of a relevant Rule or where the consequences of a Rule are uncertain, a summary in which all pertinent facts are outlined should be submitted to the Judicial Commission for consideration 
Rule 5a

Definitions of the taxonomic categories will inevitably vary with individual opinion, but the relative order of these categories may not be altered in any classification.

Rule 5b

The taxonomic categories above and including species which are covered by these Rules are given below in ascending taxonomic rank. Those in the left-hand column should be recognized where pertinent; those in the right-hand column are optional. The Latin equivalents are given in parentheses.

Answer 2

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here is your answer

» ICBN stands for the international code of botanical nomenclature

» It is a set of rules governing plant nomenclature process

» From time to time, the rules are framed and revised by international botanical Congress