What are the basic components of Land Plant Cell Walls . Identify 3 of these substances and briefly state their functional significance. Some Algae secrete large quantities of colloidal polysaccharides into their cell walls. Identify two instances of these. What is Callose and where is it found .
Land Plants make secondary cell wall s which have spiral thickenings .
There are other instances in which Secondary Cell Walls are not Spirally thickened but are Unevenly Thickened . Identify one of these and briefly state its functional significance. In some cases Secondary cell walls cover the entire surface are a of the cell except for the presence of Pits. What is the functional significance of these. I can thick of at least two obvious cases for Xylem and another for Ground Tissue .