The Trapper - Jimmy's first day. The first of three short dramas set in the north-east of England in the 1840s about a young miner called Jimmy Turton. Jimmy introduces himself. He's eleven years old and he's about to start his first day working in the mine as a trapper. In the mine he'll be working alone in complete darkness, opening and closing trap doors to allow coal carts along the tunnel and to control the flow of air through the mine.
These cells help to support plants while not restraining growth due to their lack of secondary cell walls and the absence of a hardening agent in their primary cell walls. Sclerenchyma Cells Sclerenchyma cells also have a support function in plants, but unlike collenchyma cells, they have a hardening agent and are much more rigid.
It is an extracellular structure of plant cells that distinguishes them from animal cells. The wall protects the plant cell, maintains its shape, and prevents excessive uptake of water. On the level of the whole plant, the strong walls of specialized cells hold the plant up against the force of gravity. Prokaryotes, fungi and some protists also have cell walls.