Water containing cavities in vascular bundles are found in Maize.

Explanation:
Water containing cavities in vascular bundles are called water or secretory cavities. They are specialized structures found in certain plants that store and transport water. Maize, also known as corn, is a plant that possesses these water-containing cavities in its vascular bundles.

Vascular bundles are complex structures found in plants that consist of xylem and phloem tissues. Xylem is responsible for the transport of water and minerals from the roots to the other parts of the plant, while phloem is responsible for the transport of sugars and organic substances.

In Maize, the vascular bundles are scattered throughout the stem and leaf tissues. These bundles contain specialized cells called hydathodes, which are responsible for the secretion of water into the cavities. The water or secretory cavities are interconnected and allow the movement of water within the plant.

The presence of water cavities in Maize is an adaptation to its habitat. Maize is a C4 plant, which means it has a specialized mechanism for efficient photosynthesis in hot and dry conditions. The water cavities in the vascular bundles of Maize help in water storage and provide a constant supply of water to the plant, even during dry periods.

Additionally, these water cavities in Maize also help in cooling the plant. As water evaporates from the cavities, it creates a cooling effect, which is beneficial in hot environments.

In conclusion, water containing cavities in vascular bundles are found in Maize. These cavities play an important role in water storage, transport, and cooling of the plant. They are an adaptation that enables Maize to survive in hot and dry conditions.