Which of the following factors is the main problem facing xerophytic plants?

Xerophytic plants are plants that have adapted to survive in environments with little water, such as deserts. The main problem facing these plants is the lack of adequate water. Xerophytes have developed a number of adaptations to conserve water, such as having thick cuticles, reduced leaves, and extensive root systems to absorb water. However, even with these adaptations, xerophytic plants still face the challenge of obtaining enough water to survive, which is often limited in arid environments. Without adequate water, these plants cannot carry out essential processes such as photosynthesis, and will eventually die. Therefore, the lack of adequate water is the main problem facing xerophytic plants.