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Question #135610

Difficulty: 8/10 | 🟢 Free

The Question

Ecologist Paul Ehrlich’s 'Rivet Popper Hypothesis' illustrates how species loss affects ecosystem stability. When applying this model to an open ocean ecosystem characterized by an inverted pyramid of biomass, the removal of a few 'rivets' (species) at the primary producer level triggers a much faster trophic collapse than in a terrestrial forest. What is the primary ecological reason for this systemic fragility?

Options

A.
The aquatic primary producers have a lower reproductive potential, preventing rapid restoration of the trophic base.
B.
The minimal standing crop at the base provides no biomass buffer, meaning reduced functional redundancy immediately starves higher trophic levels.
C.
The pyramid of energy in such aquatic ecosystems is also inverted, leading to rapid thermodynamic instability upon species loss.
D.
Aquatic ecosystems inherently lack keystone species, making every producer species a critical 'rivet' on the airplane's wing.

Check Your Answer

Correct Answer

Step-by-Step Solution

Explanation

How the Examiner Thinks

Comparative_Analysis

Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.

Concepts Behind This Question

Inverted Biomass Pyramids|Trophic Efficiency Limits|Detritus Food Chain Dominance

Why This Question Is Tricky

Examiner Levers

Pattern Traps

Forces student to avoid "obvious" but wrong patterns or sequences.

Difficulty Boost : +2

Negative Thinking

Uses "NOT", "EXCEPT", or "INCORRECT" to flip the logic gate.

Difficulty Boost : +2

Logical Assertion

Tests the causal relationship between two true statements.

Difficulty Boost : +4

Common Mistakes

Conceptual Pivot: Integrating 'Standing Crop' dynamics of an inverted biomass pyramid with the 'Rivet Popper Hypothesis'.

The trap relies on students confusing high productivity/turnover with high standing crop, or falling for the absolute falsehood that energy pyramids can be inverted (Option C).

Quick Facts About This Question

Question Information

Subject	Biology
Chapter	Ecosystem - Class 12
Concept	Inverted Biomass Pyramids
Difficulty	8
Cognitive Load	6
Target Solve Time	140 sec
Access	Free