What type of human population is represented by the following age pyramid?
Correct answer: C. Declining population
- A. Vanishing population
- B. Stable population
- C. Declining population
- D. Expanding population
Explanation
An age pyramid is a graphic representation of an abundance of individuals of different age groups with pre-reproductive individuals at the base, reproductive individuals in the middle and post-reproductive individuals at the top. A triangular age pyramid has a high proportion of pre-reproductive individuals, a moderate number of reproductive individuals and fewer post-reproductive individuals. It represents a young or rapidly growing population. In a bell-shaped age pyramid, the number of pre-reproductive and reproductive individuals is almost equal. Post-reproductive individuals are comparatively fewer. It represents a stable or stationary population where the growth rate is nearly zero. In an urn-shaped age pyramid, the number of reproductive individuals is higher than the number of pre-reproductive individuals. It represents a declining or diminishing population.
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Ecosystems include biotic and abiotic components, food chains and webs, energy flow, nutrient cycles, populations and ecological relationships. Pollution and conservation cover air, water, soil and noise pollution, their effects on organisms, biodiversity loss, protected areas, sustainable resource use and methods for reducing environmental damage.
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