Fill in the gaps to complete the passage. Tundra is found at _______ latitudes, including areas such as ________ The _______ winters and ________ rainfall mean that vegetation is sparse.
The Correct Answer and Explanation is:
Completed Passage:
Tundra is found at high latitudes, including areas such as the Arctic and parts of Antarctica. The long, harsh winters and low rainfall mean that vegetation is sparse.
Explanation:
The tundra biome is one of the most extreme environments on Earth, characterized by its cold temperatures and minimal vegetation. It is primarily found at high latitudes, often near the poles, in regions such as the Arctic (northern Canada, Alaska, Siberia, and Greenland) and parts of Antarctica. This biome can also be found at high altitudes in mountainous regions, where conditions mimic those of polar tundras.
The tundra is defined by its long, harsh winters that can last for up to 9 months. During this time, temperatures often drop below freezing, with average winter temperatures ranging from -28°C to -34°C (-18°F to -30°F). This prolonged cold leads to the formation of permafrost, a layer of permanently frozen soil beneath the surface. Permafrost restricts root growth and prevents water drainage, further limiting plant development.
Rainfall in tundra regions is sparse, with annual precipitation typically ranging between 15-25 cm (6-10 inches), similar to desert conditions. Most of this precipitation falls as snow. The lack of moisture and nutrient-poor soils make it difficult for vegetation to thrive. As a result, tundra vegetation is sparse and includes low-growing plants like mosses, lichens, grasses, and small shrubs. These plants are adapted to survive with minimal resources and extreme cold.
During the brief summer (lasting 6-10 weeks), temperatures may rise slightly above freezing, causing the top layer of permafrost to thaw. This temporary thaw allows some plants to grow and bloom rapidly, creating a short but vibrant growing season. However, the harsh climate remains the defining factor of this biome, shaping its ecosystem and limiting biodiversity.