Biology · Man and His Environment

The correct answer is that rainfall in savannas can be up to 200 cm per year. This amount of precipitation supports the growth of grasses and scattered trees, which are characteristic of the savanna biome. Other options are incorrect: temperatures in savannas do not fluctuate by more than 18°C throughout the year; many savanna plants shed their leaves during the dry season; the subsoil does not freeze permanently, as this occurs in tundra regions; and evaporation often exceeds rainfall, particularly in the dry season, creating a water deficit.

While savannas experience long dry seasons, the temperature range is not as extreme as stated. Typically, temperatures range from 20 to 30°C (68 to 86°F) during the wet season and 10 to 20°C (50 to 68°F) during the dry season. This option inaccurately describes the temperature variation.

Many savanna plants, especially grasses, are deciduous and shed their leaves during the dry season to conserve water. While some plants may be evergreen, this statement is generally false for savanna ecosystems.

Savannas are located in tropical and subtropical regions, where the subsoil does not freeze permanently. Permanent freezing is characteristic of tundra biomes, not savannas.

Savannas experience a distinct wet season with heavy rainfall, typically receiving annual precipitation ranging from 50 to 200 centimetres (20 to 80 inches). This option accurately describes the rainfall pattern in savannas.

In savannas, evaporation rates often exceed rainfall, especially during the dry season, leading to water scarcity. This statement is inaccurate as it contradicts the typical water balance in savannas.