Q.

The presence of air cavities is an adaptation of -

A. Desert plants
B. Trees
C. Water plants
D. Mesophytes
Answer» C. Water plants
Explanation: Totally submerged plants are the true water plants or hydrophytes. Because they are truly aquatic they have the greatest number of adaptations to life in water. Air-filled cavities often extend throughout the leaves and stems of aquatic plants, providing an internal atmosphere.
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