If an area is so dry that plants are sparse and leaves are thorny, why can it not be evergreen forest?

Correct answer: Evergreen forest is linked with high moisture and dense greenery

Direct answer: Option C. Evergreen forests require abundant moisture and usually form dense, continuously green vegetation. In a very dry region, plants are sparse and often have small, thick or thorny leaves. These features reduce water loss and indicate thorn or scrub vegetation, not a humid evergreen forest. Option C gives the correct ecological contrast: high moisture supports dense evergreen growth, while severe dryness prevents it. Option A is wrong because evergreen forests do not always require saline water; saline conditions are especially associated with mangroves. Option B is wrong because evergreen forests are not restricted to areas above the tree line; tropical evergreen forests can occur at low elevations. Option D is wrong because evergreen means foliage is retained, not that the forest has no leaves. The word “evergreen” means leaves are present throughout the year, though individual leaves may be replaced at different times. Memory cue: thorny and sparse means dry; dense and green means moist.