Questions: Biomes Overview

Question 1

What two factors most determine which biome exists in a given location?

• A. Altitude and longitude
• B. Temperature and precipitation
• C. Soil type and wind speed
• D. Latitude and ocean currents

Answer: (B)

Temperature and precipitation are the two primary climate factors that determine biome type. Hot and wet conditions produce tropical rainforests; cold and dry conditions produce tundra; hot and dry conditions produce deserts. While latitude, altitude, and ocean currents influence temperature and precipitation, it is ultimately the climate itself that determines the biome.

Question 2

Most deserts are hot and sandy.

• T. True
• F. False

Answer: False

Deserts are defined by low precipitation (less than 25 cm/10 inches per year), not by temperature. While the Sahara is hot and sandy, the Gobi Desert in Asia is cold, and Antarctica is technically the largest desert on Earth because it receives very little precipitation. The defining feature is dryness, not heat.

Question 3

Explain why tropical rainforests have the greatest biodiversity of any terrestrial biome.

Model answer: Tropical rainforests have warm temperatures year-round and receive heavy rainfall, providing abundant energy (sunlight) and water for plant growth. The dense vegetation creates many different habitats — from the forest floor to the canopy — supporting a huge variety of species. The stable, warm climate also means organisms do not need to survive harsh winters, allowing more species to thrive.

High energy input (sunlight) and high water availability drive high productivity, which supports complex food webs and many ecological niches. The vertical structure of the forest (floor, understory, canopy, emergent layer) multiplies the available habitats within a small area.