Science P6 MBS 2018 SA1 Q03

Sam made some observations of how the leaves of some plants adapt to their environment. He recorded his observations in the table shown below.
PlantAdaptationFunction
Xair spaces in leaveshelps the plant to float
Ywaxy leavesprevents water from collecting on the leaves
Zneedle-like leavesreduce water loss
Based on the information given above, which of the following correctly describes the reason for the adaptation of leaves X, Y and Z?