(a) Aquatic plants have large air cavities in their parenchyma to give buoyancy to plants which help them float.
(b) The cells of sclerenchymatous tissue are long and narrow as the walls are thickened due to lignin (a chemical substance which acts as cement and hardens them). Since they are lignified there is no intercellular space between the cell.
(c) We get a crunchy and granular feeling when we chew pear fruit. It is due to the presence of stone cells (sclerenchyma).
(d) The flexibility in plants is due to a permanent tissue, collenchyma. It allows easy bending in various parts of a plant (leaf, stem) without breaking. It also provides mechanical support to plants.
(e) The husk of a coconut is made of sclerenchymatous tissue. They are lignified and make it difficult to pull.