Which of the following vegetation types is mainly confined to the Northern hemisphere?

The vegetation type that is mainly confined to the Northern hemisphere is the Tundra. This is because the Tundra is characterized by cold and harsh climates, and is found at high latitudes in the Northern hemisphere, particularly in the Arctic regions. The Tundra is dominated by low-growing vegetation, such as mosses, lichens, and shrubs, and has a permafrost layer that prevents deep-rooted plants from growing. In contrast, the other vegetation types listed, such as Tropical Grassland, Equatorial Forest, and Desert, are found in various parts of the world, including both the Northern and Southern hemispheres.