Key Scientists to Remember in Biodiversity (May, Humboldt, Ehrlich, Tilman, Myers, Wilson)
Biology · Biodiversity and Conservation · NEET
Six scientists are asked again and again in the Biodiversity chapter, and NEET now tests them as match-the-column. Remember: Wilson popularised the word "biodiversity", Humboldt gave the species-area relationship, Robert May estimated 7 million global species, Tilman did outdoor plot experiments on stability, Ehrlich gave the rivet-popper hypothesis, and Norman Myers gave the biodiversity hotspots idea. Memory hook: "We Have Many Tigers, Elephants, Monkeys" = Wilson, Humboldt, May, Tilman, Ehrlich, Myers.
Quick-reference map of the six scientists tested in Biodiversity and Conservation, with the most common NEET trap (Humboldt vs Robert May) highlighted.
Your doubts, answered
Who gave the species-area relationship, Humboldt or Robert May?
Alexander von Humboldt gave the species-area relationship (species richness rises with area up to a limit). Robert May is different — he estimated the total number of species on Earth at about 7 million. NEET 2017 asked exactly this and the answer was Humboldt for species-area.
Who estimated 7 million species and who described 1.7 million?
Robert May ESTIMATED the global species diversity at about 7 million. The 1.7-1.8 million figure is not one scientist's estimate — it is simply the number of species actually known and described so far. Do not attach May's name to 1.7 million.
What is the difference between the rivet-popper hypothesis and Tilman's experiment?
Both are about species and ecosystem function but by different people. Paul Ehrlich gave the rivet-popper hypothesis (an airplane analogy — each species is a rivet). David Tilman did real outdoor plot experiments and found that more species means more stability (less year-to-year variation in biomass). Ehrlich = analogy, Tilman = experiment.
Who popularised the word 'biodiversity' and who gave hotspots?
Edward Wilson (a sociobiologist) popularised the term biodiversity. Norman Myers gave the concept of biodiversity hotspots. Students often swap these two — Wilson = the word, Myers = hotspots.
Is Humboldt German or American?
NCERT calls Alexander von Humboldt a German naturalist and geographer. This detail is rarely tested, but the concept he gave (species-area relationship) is very frequently tested, so focus on the concept.
⚠️ The NEET trap ✗ Robert May gave the species-area relationship. ✓ Humboldt gave the species-area relationship; Robert May estimated ~7 million global species. 🧠 Humboldt = area; May = 7 million. Never swap them — this is the single most common trap in match-the-column questions.
Real NEET questions
NEET 2024
Match List I with List II. A. Robert May B. Alexander von Humboldt C. Paul Ehrlich D. David Tilman with I. Species-Area relationship II. Long term ecosystem experiment using outdoor plots III. Global species diversity at about 7 million IV. Rivet popper hypothesis
A · A-III, B-I, C-IV, D-II ✓
B · A-I, B-III, C-II, D-IV
C · A-III, B-IV, C-II, D-I
D · A-II, B-III, C-I, D-IV
Solution: Robert May = 7 million (III), Humboldt = species-area relationship (I), Ehrlich = rivet-popper (IV), Tilman = outdoor plot experiments (II). So A-III, B-I, C-IV, D-II.
NEET 2017
Alexander von Humboldt described for the first time:
A · Ecological Biodiversity
B · Laws of limiting factor
C · Species area relationships ✓
D · Population Growth equation
Solution: NCERT credits Humboldt with first observing that within a region species richness increases with area up to a limit — the species-area relationship.
NEET 2020
According to Robert May, the global species diversity is about:
A · 50 million
B · 7 million ✓
C · 1.5 million
D · 20 million
Solution: Robert May's estimate of global species diversity is about 7 million, though only 1.7-1.8 million have actually been described.
Solved Biodiversity and Conservation NEET PYQs
Try the real previous-year questions from this chapter — each with the answer and a full solution.
Which scientists must I remember for the Biodiversity chapter in NEET?
Six names: Edward Wilson (popularised 'biodiversity'), Alexander von Humboldt (species-area relationship), Robert May (7 million species estimate), David Tilman (outdoor plot experiments on stability), Paul Ehrlich (rivet-popper hypothesis), and Norman Myers (biodiversity hotspots).
Why is this topic important for NEET?
NEET has directly asked match-the-column (2024), Humboldt (2017), and Robert May (2020) from this exact set. One or two names are almost guaranteed, so memorising the pairs is high-yield and easy marks.
What is an easy way to memorise these pairs?
Use one hook per name: Wilson = Word, Humboldt = area (Higher area = more species), May = 7 Million, Tilman = plots/sTability, Ehrlich = rivets, Myers = hotspots (M for Myers, M for hotspot Map).
Who gave the rivet-popper hypothesis?
Paul Ehrlich, a Stanford ecologist, gave the rivet-popper hypothesis. It compares an ecosystem to an airplane where each species is a rivet; losing rivets one by one eventually causes failure.
