Which cell has fibre-like structure

Sclerenchyma

Explanation:

Sclerenchyma is the term used to denote a tissue or cell type that has lignified walls.Sclerenchyma cells have thick lignified secondary walls and dies out  when mature and provides the main structural support to a plant.Sclerenchyma is the tissue which makes the plant hard in nature. Sclerenchyma is the supporting tissue.Two types of sclerenchyma cells are there : fibers and sclereids.Their cell walls are made up of cellulose, hemicellulose, and lignin.

Cells of an organism tell each other when predators are near.