Consider the following ecosystems: 1. Taiga 2. Tropical evergreen 3. Tropical deciduous 4. Tundra The correct sequence in decreasing order of the albedo values of these ecosystems is

1. The question asks for the correct sequence of four different ecosystems arranged in decreasing order of their typical surface albedo values. 2. Albedo is the measure of the reflectivity of a surface; higher albedo means more sunlight is reflected. 3. Typical albedo values for the given ecosystems: - Tundra (4): Often covered in snow and ice for large parts of the year, especially in winter. Snow has a very high albedo (can exceed 0.8 or 80%). Even summer tundra vegetation has moderate albedo. Overall, tends to have the highest average albedo among the options. - Taiga (1) (Boreal Forest): Dominated by coniferous trees, which are generally dark and absorb sunlight, especially when snow-free. Snow cover in winter increases albedo significantly, but the forest canopy reduces the effect compared to open tundra. Typical albedo might range from 0.1 to 0.5 (depending on season/snow). - Tropical deciduous (3): These forests shed leaves in the dry season. Leafy canopy has moderate albedo (0.1-0.2). Dry ground/litter might have slightly higher albedo. Overall, moderate to low. - Tropical evergreen (2) (Rainforest): Dense, dark green canopy year-round absorbs a large amount of sunlight. Has a very low albedo, typically around 0.1. 4. Arranging in decreasing order of typical albedo: Tundra (highest due to snow potential) > Taiga (variable, high with snow, lower without) > Tropical deciduous (moderate to low) > Tropical evergreen (lowest). 5. This sequence corresponds to 4, 1, 3, 2.