AP BIOLOGY

Detailed explanation-1: -The earth of the Arctic tundra has a permanently frozen subsoil, called permafrost, which makes it impossible for trees to grow.

Detailed explanation-2: -As a result, solar energy is less intense in the taiga biome because it is spread out over a greater area of Earth’s surface than it is in equatorial regions.

Detailed explanation-3: -Tundra biome is located in the far north and is characterized by persistent soil ice (permafrost) throughout the growing season which in turn does not allow growth of any vegetation.

Detailed explanation-4: -The temperatures are so cold that there is a layer of permanently frozen ground below the surface, called permafrost. This permafrost is a defining characteristic of the tundra biome.

Detailed explanation-5: -Deserts generally occur in a band around the world between 15–30° N and S latitude (Figure 4). They cover between 26–35% of the land surface of the Earth. The climate of deserts is dominated by low precipitation, generally below 250 mm yr-1 (Figure 7).