NEET Mnemonics
7 memory tricks · NCERT-based · NEET 2027 · High-Yield
How to use these mnemonics: Read each acronym device aloud, then trace through the letter-by-letter expansion below it. Visualise the linked concepts. Test yourself by covering the expansion and recalling from the device alone.
All 7 Mnemonics for Evolution
1. Origin-of-life timeline — "20-4.5-4"
Mnemonic Device
Big Bang ~20 bya · Earth ~4.5 bya · Life ~4 bya
20 bya
Big Bang — universe forms
4.5 bya
Earth forms
~4 bya
Life appears in the oceans
2. Miller–Urey gases — "MAHW"
Mnemonic Device
M ethane · A mmonia · H ydrogen · W ater vapour → amino acids
M
Methane (CH₄)
A
Ammonia (NH₃)
H
Hydrogen (H₂)
W
Water vapour + electric spark → amino acids
3. Homologous vs Analogous — "Homo=Same origin, Ana=Same function"
Mnemonic Device
Homo logous → divergent (same origin) · Ana logous → convergent (same function)
Homologous
Whale/bat/human forelimb — divergent
Analogous
Butterfly & bird wing — convergent
Trick
Homo = same Home (origin); Ana = same Action (function)
4. Hardy–Weinberg 5 factors — "Mget-M-R-S" (Migration, Drift, Mutation, Recombination, Selection)
Mnemonic Device
M igration · genetic D rift · M utation · R ecombination · natural S election
Migration
Gene flow between populations
Drift
Random change; founder effect
Mutation
New alleles
Recombination
New combinations
Selection
Non-random survival
5. Selection types — "Stab-Direct-Disrupt"
Mnemonic Device
Stabilising (middle) · Directional (one end) · Disruptive (both ends)
Stabilising
Favours average, one peak stays
Directional
Favours one extreme, mean shifts
Disruptive
Favours both extremes, two peaks
6. Human evolution order — "Dry-Aus-Habilis-Erectus-Neander-Sapiens"
Mnemonic Device
Dry opithecus → Aus tralopithecus → H. habilis → H. erectus → Neander thal → H. sapiens
Dryopithecus
~15 mya, ape-like
Australopithecus
~3–4 mya, upright
H. habilis
~2 mya, 650–800 cc, no meat
H. erectus
~1.5 mya, 900 cc, ate meat
Neanderthal
1400 cc, buried dead
H. sapiens
Modern human, from Africa
7. Brain-size ladder — "habilis
Mnemonic Device
650–800 (habilis) → 900 (erectus) → 1400 (Neanderthal)
650–800 cc
Homo habilis
900 cc
Homo erectus
1400 cc
Neanderthal (large!)
Frequently Asked Questions
What is a good mnemonic for Evolution?
"Origin-of-life timeline — "20-4.5-4"" — a popular device for this chapter tested in NEET.
How to memorise Evolution for NEET 2027 quickly?
NCERT once → use mnemonics → active recall flashcards → 20+ MCQs. This loop is fastest for retention.
How many mnemonics are there for Evolution?
7 curated mnemonics, covering all high-yield NEET subtopics in this chapter.