Before You Begin
Question #46620
The Question
Consider an aquatic ecosystem exhibiting an inverted pyramid of biomass, where the standing crop of phytoplankton is significantly lower than that of zooplankton. Which of the following statements regarding the energy flow and stability of this ecosystem is INCORRECT?
Options
- A.
The pyramid of energy for this ecosystem remains strictly upright, as energy transfer follows the 10 percent law.
- B.
The rapid turnover rate and short lifespan of phytoplankton compensate for their low standing crop.
- C.
The gross primary productivity of the phytoplankton is lower than the secondary productivity of the zooplankton.
- D.
The continuous generation of phytoplankton biomass exceeds the rate at which it is consumed by zooplankton over time.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
Intrinsic Rate of Increase (r)|Environmental Resistance|K-selection
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students frequently confuse 'Standing Crop' (a static measure of mass at a given moment) with 'Productivity' (a kinetic rate of energy/mass generation over time).
The trap exploits the visual of an inverted biomass pyramid, leading students to falsely assume that the primary productivity must also be lower at the base, which would violate fundamental thermodynamic laws.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Organisms and Populations - Class 12 |
| Concept | Age Pyramids (Stable vs Declining) |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |