 
 <prompt> Tomatoes no fit dey grow for market if dis polymer no dey. Given di previous question, write a context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: Plants dey produce plenty different kind polymers like di polysaccharide molecules cellulose, pectin and xyloglucan from which di land plant cell wall dey build. Vascular land plants dey make lignin, wey be polymer wey dem dey use to strengthen di secondary cell walls of xylem tracheids and vessels to prevent dem from collapsing wen plant dey suck water through dem under water stress. Lignin dey also used for other cell types like sclerenchyma fibers wey dey provide structural support for plant and e dey major part of wood. Sporopollenin na chemical resistant polymer wey dey for di outer cell walls of spores and pollen of land plants wey dey responsible for di survival of early land plant spores and di pollen of seed plants for fossil record. E dey widely accepted as marker for di beginning of land plant evolution during di Ordovician period. Di concentration of carbon dioxide for di atmosphere today dey much lower pass wetin e be wen plants first enter land during di Ordovician and Silurian periods. Many monocots like maize and pineapple and some dicots like di Asteraceae don since independently evolve pathways like Crassulacean acid metabolism and di C4 carbon fixation pathway for photosynthesis wey avoid di losses wey dey come from photorespiration for di more common C3 carbon fixation pathway. Dis biochemical strategies dey unique to land plants. 