Another enzyme (there are a number of them) can be called on to perform a different task. Instead of attaching glucose molecules hand to hand to make starch, this enzyme connects glucose molecules hand to foot, and the resulting chain is called fibre. This substance is as important as grout between the bricks of a house. It’s what allows plants to grow tall without falling over. It’s most commonly found in trunks, branches, flowers and leaves, but there is fibre in roots and fruit as well.