Tundra is the correct answer for the biome popularly known as the Arctic Desert. The tundra biome is characterized by extremely cold temperatures, low precipitation, and a short growing season. It is found in the Arctic region, which includes parts of Alaska, Canada, Russia, and Scandinavia.

The Arctic Desert is often referred to as a desert because it receives very little precipitation, similar to other desert biomes. However, unlike hot deserts, the Arctic Desert experiences freezing temperatures for most of the year, making it inhospitable for most forms of life.

Here is a detailed explanation of why the tundra is referred to as the Arctic Desert:

Extreme Climate:
- The tundra biome is known for its extreme climate, with long, cold winters and short, cool summers. Average temperatures in the Arctic Desert range from -30°C (-22°F) in winter to around 10°C (50°F) in summer.
- The freezing temperatures persist for most of the year, resulting in a frozen landscape. The ground remains permanently frozen, known as permafrost, which limits the growth of vegetation.

Low Precipitation:
- Precipitation in the Arctic Desert is low, with an average annual rainfall of less than 250 mm (10 inches). This is comparable to some of the driest deserts on Earth.
- The limited precipitation falls mostly as snow during the winter months. The snow cover insulates the ground, preventing the growth of plants during the cold season.

Short Growing Season:
- Due to the extreme cold temperatures, the growing season in the Arctic Desert is very short, lasting only a few months. During this time, the top layer of permafrost thaws, allowing plants to grow and reproduce.
- The limited growing season restricts the diversity and abundance of plant species in the tundra biome. Mosses, lichens, and dwarf shrubs are the dominant forms of vegetation.

Lack of Trees:
- The Arctic Desert is characterized by a lack of trees. The harsh climate and frozen soil make it difficult for trees to establish deep root systems and survive. Instead, the tundra is dominated by low-growing vegetation.
- The absence of trees further contributes to the desert-like appearance of the Arctic biome.

In conclusion, the Arctic Desert is commonly referred to as the tundra biome due to its extreme climate, low precipitation, short growing season, and lack of trees. These factors make it similar to other desert biomes, despite the cold temperatures.