Multiple Choice
Which of the following graphs best represents the longitudinal profile of a typical river from its source to its mouth?
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48. Ecology
Introduction to Ecology
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Which of the following observations provides the best evidence of a biodiversity crisis?
A
Fluctuations in the population size of a local predator due to prey availability
B
Seasonal migration patterns of birds changing slightly each year
C
A rapid increase in the extinction rate of multiple species across different ecosystems
D
A single species of plant showing increased growth in a particular region
Verified step by step guidance1
Understand the concept of biodiversity crisis: A biodiversity crisis refers to a significant and rapid decline in the variety of life forms within ecosystems, often due to human activities, environmental changes, or other factors.
Evaluate the options provided: Analyze each observation to determine whether it indicates a widespread and rapid decline in biodiversity across multiple species and ecosystems.
Option 1: Fluctuations in predator population size due to prey availability are natural and do not necessarily indicate a biodiversity crisis. This is a localized and cyclical phenomenon.
Option 2: Seasonal migration patterns of birds changing slightly each year may reflect environmental changes but do not directly indicate a rapid loss of biodiversity across ecosystems.
Option 3: A rapid increase in the extinction rate of multiple species across different ecosystems is the strongest evidence of a biodiversity crisis, as it demonstrates widespread and irreversible loss of biodiversity. Option 4, increased growth of a single plant species, is localized and does not indicate a crisis.
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