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Q.161 Zoology ⭐ 360° Option Elimination Active
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NEET 2021 Zoology Question 161 Solution

Topic: The Living World · Official NTA Booklet Code M1
NEET 2021 Zoology Question 161: Taxonomic Categories and Classification of Housefly (Musca domestica)

Question

Which one of the following belongs to the family Muscidae?

  1. (1)Fire fly
  2. (2)Grasshopper
  3. (3)Cockroach
  4. (4)House fly
✓
Verified Against NTA Final Answer Key
Option (4) : House fly
📚 The Living World Easy
📋 Given Parameters & Problem Setup
Family Muscidae
Candidate Insects (1) Fire fly, (2) Grasshopper, (3) Cockroach, (4) House fly
⚡

The 30-Second Exam Hall Shortcut: ⚡ "Musca domestica → Family Muscidae"

⏱️ Save ~20 seconds

The common housefly is Musca domestica. Genus: Musca; Family: Muscidae (NCERT taxonomy table). Cockroach belongs to Blattidae, grasshopper to Acrididae, firefly to Lampyridae. Match Option (4) in 5 seconds!

1 Recall the scientific name of the housefly: Musca domestica.
2 Recall its taxonomic hierarchy: Genus = Musca, Family = Muscidae, Order = Diptera, Class = Insecta, Phylum = Arthropoda.
3 Select Option (4).
🛡️
Why You Can 100% Trust This Shortcut: NCERT Biology · The Living World (Organisms with their Taxonomic Categories: Housefly: Musca domestica, genus Musca, family Muscidae, order Diptera).
📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Taxonomic Hierarchy of Musca domestica

NCERT provides a mandatory reference table of model organisms and their complete taxonomic hierarchy: - Common Name: Housefly - Biological Name: *Musca domestica* - Genus: *Musca* - Family: *Muscidae* - Order: *Diptera* - Class: *Insecta* - Phylum: *Arthropoda*

Housefly  ⟹  {Genus:MuscaFamily:MuscidaeOrder:DipteraClass:InsectaPhylum:Arthropoda\text{Housefly} \implies \begin{cases} \textbf{Genus:} & \text{Musca} \\[2pt] \textbf{Family:} & \mathbf{Muscidae} \\[2pt] \textbf{Order:} & \text{Diptera} \\[2pt] \textbf{Class:} & \text{Insecta} \\[2pt] \textbf{Phylum:} & \text{Arthropoda} \end{cases}
Step 2

Taxonomic Families of Other Candidate Insects

- Fire fly: Order Coleoptera, Family *Lampyridae* (bioluminescent beetles). - Grasshopper: Order Orthoptera, Family *Acrididae*. - Cockroach (*Periplaneta americana*): Order Blattodea, Family *Blattidae*.

⭐

360° Option Elimination Engine Key Feature

Diagnose every choice: Know exactly why the right option works and why distractors fail.

4-Option Deep Scan
1 1
✗ Incorrect
Verdict & Scientific Reason:

Incorrect. Fireflies are winged beetles of the family Lampyridae.

⚠️
Student Fallacy (Why candidates pick this trap): Associating "fly" in the common name with the family Muscidae.
2 2
✗ Incorrect
Verdict & Scientific Reason:

Incorrect. Grasshopper belongs to Acrididae.

⚠️
Student Fallacy (Why candidates pick this trap): Conflating different insect orders (Orthoptera vs Diptera).
3 3
✗ Incorrect
Verdict & Scientific Reason:

Incorrect. Cockroach (*Periplaneta americana*) belongs to the family Blattidae.

⚠️
Student Fallacy (Why candidates pick this trap): Assuming common laboratory insect models belong to the same taxonomic family.
4 4
✓ 100% Correct
Verdict & Scientific Reason:

Correct. The housefly (*Musca domestica*) is the quintessential member of the family Muscidae.

💡
Why this is airtight: None. Direct recall of NCERT classification table.
⚠️

NTA Trap Alert: Common Name "Fly" Misconception

Insects named "fly" (dragonfly, firefly, butter-fly, housefly) belong to wildly different orders: firefly = Coleoptera, dragonfly = Odonata, butterfly = Lepidoptera, housefly = Diptera.

🛡️ How to avoid the -1 mark: True flies belong to Diptera (two wings) and housefly specifically belongs to Muscidae.
📖

Core NEET Syllabus Standard

NEET / NCERT Biology · The Living World Standard Benchmark
Core Scientific Principle Tested:

"The housefly (Musca domestica) belongs to genus Musca and family Muscidae in order Diptera."

Syllabus Focus: Taxonomic Categories and Classification
✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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