Understanding Singular and Plural Word Relationships in Analogies

The question asks us to find a word pair that has the same relationship as 'Leaf : Leaves'. The relationship between 'Leaf' and 'Leaves' is singular to plural. 'Leaf' is the singular form, and 'Leaves' is the plural form.

We need to examine the given options to find the pair that follows the same singular to plural pattern.

Analyzing the Options

• Option 1: Nuclei : Nucleus

  Here, 'Nuclei' is the plural form and 'Nucleus' is the singular form. The relationship is plural to singular, which is the reverse of the pattern in the question (singular to plural).

• Option 2: theses : thesis

  Here, 'theses' is the plural form and 'thesis' is the singular form. The relationship is plural to singular, which does not match the pattern in the question.

• Option 3: Crises : Crisis

  Here, 'Crises' is the plural form and 'Crisis' is the singular form. The relationship is plural to singular, which is not the same as the pattern in the question.

• Option 4: Focus : Foci

  Here, 'Focus' is the singular form and 'Foci' is the plural form. The relationship is singular to plural, which matches the pattern in the question (Leaf : Leaves).

Comparing Relationships

Let's list the singular and plural forms for clarity:

The pattern in the question is Singular → Plural. Looking at the table, only Option 4 follows this pattern with 'Focus' (singular) changing to 'Foci' (plural).

Conclusion

The analogy 'Leaf : Leaves' shows the relationship between a singular noun and its plural form. Among the given alternatives, only the pair 'Focus : Foci' exhibits the same singular to plural relationship. Therefore, this is the correct related word pair.