Which of the following Venn diagrams best represents the relationship between horses, herbivores and domestic… - DSSSB - 29 August 2019 (Shift-2)

DSSSB - 29 August 2019 (Shift-2)

Reasoning

Hard

Appeared in: DSSSB - 29 August 2019 (Shift-2)

Explanation

The question requires identifying the Venn diagram that correctly shows the relationship between three sets: Horses, Herbivores, and Domestic Animals.
The core logical relationship is that all horses are both herbivores and domestic animals. This means the 'Horses' set is a subset of the other two sets.
Additionally, the sets 'Herbivores' and 'Domestic Animals' have a partial overlap (intersection), as some herbivores are not domestic (like deer) and some domestic animals are not herbivores (like dogs).
Diagram D correctly depicts this by placing a small circle (Horses) entirely within the intersection of two larger, overlapping circles (Herbivores and Domestic Animals).

Option A: This diagram shows three disjoint sets, implying no relationship or overlap between horses, herbivores, and domestic animals. This is factually incorrect.
Option B: This diagram shows a chain of intersections but fails to represent that 'Horses' is a complete subset of both 'Herbivores' and 'Domestic Animals'. It only suggests partial overlaps between adjacent groups.
Option C: This diagram shows three concentric circles, implying a full subset hierarchy (e.g., A is a subset of B, and B is a subset of C). This is wrong because not all herbivores are domestic animals.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Logical relationship representation using Venn diagrams as background academic context rather than a clinical decision trigger.
While not a clinical question, logical reasoning is a foundational skill for nurses to interpret data, identify patterns in patient symptoms, and make sound clinical judgments.
This type of set theory problem helps develop the analytical thinking needed to understand overlapping categories, such as patient populations with multiple comorbidities (e.g., patients with both diabetes and hypertension).
Nurses use this logic to classify patient needs and prioritize care. For example, a patient can be in the set of 'post-operative', 'diabetic', and 'at risk for falls' simultaneously, requiring integrated care planning.

How to Approach the Question

First, identify the three distinct groups in the question: Horses, Herbivores, and Domestic Animals.
Next, determine the logical relationship between each pair of groups. Ask questions like: 'Are all X's also Y's?' (subset), 'Are some X's also Y's?' (intersection), or 'Are no X's also Y's?' (disjoint).
Establish the relationships: 1) All horses are herbivores. 2) All horses are domestic animals. 3) Some herbivores are domestic, and some are not.
Synthesize these relationships into a visual structure. 'Horses' must be a subset of the intersection of 'Herbivores' and 'Domestic Animals'.
Finally, examine each diagram (A, B, C, D) and select the one that visually matches the established logical structure.

Concept Tested & Keywords

Concept Tested: Logical relationship representation using Venn diagrams
Stem keywords: Venn diagrams, relationship, horses, herbivores, domestic animals
Lead-in keywords: best represents
Negative lead-in flag: false

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