Ecology: Why Big Fierce Animals Are Rare
From deserts and population booms to food webs and nutrient cycles, the ideas that explain how living things share the planet.
Ecology · 50 questions
Try 3 questions
1. What mainly determines which biome, such as desert or rainforest, occupies a region?
- Its temperature and rainfall
- The type of rock beneath it
- The animals that live there
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Answer: Its temperature and rainfall
Climate sets which plants can grow, and the dominant vegetation defines the biome.
2. Why are many tropical rainforest soils surprisingly poor in nutrients?
- Most nutrients are held in living plants
- Heavy rain adds too much nitrogen
- Few organisms decompose matter there
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Answer: Most nutrients are held in living plants
Warmth and moisture make decomposition fast, and plants quickly reabsorb nutrients while heavy rain leaches the rest.
3. Climbing from the base to the snowy peak of a tall tropical mountain in the Andes resembles what journey?
- Traveling from the coast to a desert
- Traveling from the equator to the poles
- Moving from summer into autumn
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Answer: Traveling from the equator to the poles
Temperature falls with altitude, so vegetation zones stack up the slope much as biomes change with latitude.
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