Problem: Solving a Multi-Step Tissue Identification MCQ

Question (NEET-style): A tissue X has the following properties: cells in lacunae, avascular, matrix is chondroitin sulfate, no central canal, found in the ear pinna. Identify X and name a structure where a DIFFERENT type of the SAME tissue category is found.

Step 1 — Identify the tissue category from "cells in lacunae": Both bone AND cartilage have cells in lacunae. This is our starting shortlist: bone or cartilage.

Step 2 — Eliminate bone using additional clues:

• Bone matrix = calcium phosphate (given: chondroitin sulfate → NOT bone)
• Bone has a central Haversian canal (given: no central canal → NOT bone)
• Bone is vascular (given: avascular → NOT bone) All three criteria eliminate bone → X is CARTILAGE.

Step 3 — Identify cartilage TYPE from "ear pinna": Three cartilage types by location:

• Hyaline → trachea (NOT ear pinna)
• Elastic → ear pinna ✓
• Fibrocartilage → intervertebral discs (NOT ear pinna) → X is ELASTIC CARTILAGE

Step 4 — Name a structure with a DIFFERENT type of the SAME tissue: Same tissue category = cartilage. Different type = hyaline (trachea) or fibrocartilage (intervertebral discs). Answer: Trachea (hyaline cartilage) OR intervertebral discs (fibrocartilage).

Final Answer: Tissue X = Elastic cartilage (ear pinna). Another structure = trachea (hyaline cartilage) or intervertebral discs (fibrocartilage).

Exam Strategy Used:

1. Build a shortlist from the most general clue (lacunae → bone or cartilage)
2. Use each additional clue as an elimination filter
3. The final specific clue (ear pinna) gives the subtype
4. Never skip to the final answer — work through elimination to avoid traps