Final answer:
Cacti have visible leaf modifications to conserve water in dry environments.
Step-by-step explanation:
The plant that has a visible leaf modification to conserve water in extremely dry environments is cactus. Cacti have spines instead of leaves, which helps reduce water loss through transpiration. These spines also create a layer of still air around the plant, reducing water loss through evaporation.
Learn more about Cactus leaf modifications