Classification — study field vs subject: pick the pair that does NOT share the same “study-of → subject” relation as the rest.

Introduction / Context:Three pairs show a discipline directly mapped to its subject of study (X = study of Y). One pair instead shows a broad science and one of its sub-branches (whole → part), not the “study-of → subject” pattern.

Given Data / Assumptions:

• Ornithology : Birds → study of birds.
• Mycology : Fungi → study of fungi.
• Phycology : Algae → study of algae (spelling corrected from “Algee”).
• Biology : Botany → botany is a branch of biology, not the “thing” biology studies; biology studies living organisms in general.

Concept / Approach:Identify which right-hand term is a “subject” (birds, fungi, algae) versus a “sub-discipline” (botany). The odd pair must be the only whole→part relation.

Step-by-Step Solution:

Verification / Alternative check:Try reversing: “Birds : Ornithology” (subject → study) still fits; “Botany : Biology” is subfield → field, not subject → study.

Why Other Options Are Wrong:They all retain the clear study-of mapping.

Common Pitfalls:Confusing “any relation” with “the same relation across three pairs.” The test asks for the lone different relation.

Final Answer:Biology : Botany