Rivet Popper Hypothesis & Species Loss — NEET Biology
✅ Asked in NEET 2023In 'rivet popper hypothesis', Paul Ehrlich compared the rivets in an airplane to: (NEET 2023)
In 'rivet popper hypothesis', Paul Ehrlich compared the rivets in an airplane to: (NEET 2023)
Answer & NCERT explanation
Correct answer: A — Species within a genus
In Paul Ehrlich's rivet popper hypothesis, he compared species within a genus to rivets in an airplane. Just as removing rivets weakens the airplane structure, losing species from a genus weakens ecosystem stability. Initially, removing few rivets (species) may not affect the plane (ecosystem), but continued loss eventually leads to catastrophic failure. This analogy explains how biodiversity loss impacts ecosystem functioning.
Read more NCERT concept on the PYQ
There are no direct answers to such naïve questions but we can develop a proper perspective through an analogy (the 'rivet popper hypothesis') used by Stanford ecologist Paul Ehrlich. In an airplane (ecosystem) all parts are joined together using thousands of rivets (species). If every passenger travelling in it starts popping a rivet to take home (causing a species to become extinct), it may not affect flight safety (proper functioning of the ecosystem) initially, but as more and more rivets are removed, the plane becomes dangerously weak over a period of time. Furthermore, which rivet is removed may also be critical. Loss of rivets on the wings (key species that drive major ecosystem functions) is obviously a more serious threat to flight safety than loss of a few rivets on the seats or windows inside the plane.
The rivet popper hypothesis explains how species extinction affects ecosystem stability through an airplane analogy. Each species is like a rivet—losing one may seem harmless initially, but gradual extinction weakens the entire ecosystem. NTA tests whether students understand that not all species have equal importance: keystone species (like rivets on wings) are critical, while others are redundant. Students often wrongly assume all species losses are equally damaging or that ecosystems can tolerate unlimited extinction. Remember: early extinctions may show no visible effect, but cumulative loss causes ecosystem collapse. Identifying which species are functionally important is key to conservation strategy.
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