How do swollen stems in desert plants contribute to their survival?

Swollen stems in desert plants are critical for survival because they serve as water storage units. In arid environments where water is scarce, these plants have evolved to store considerable amounts of water in their stems. This adaptation enables them to endure long periods without rainfall. When the surrounding environment becomes dry, the plant can draw upon its stored water to maintain vital functions such as photosynthesis and growth. This efficient water storage mechanism is particularly beneficial during droughts, where water availability is unpredictable. Such adaptations greatly enhance the plant's chances of surviving in harsh desert conditions.