A-LevelBiologyThe mitotic cell cycleMay/June 2023Paper 2 Q214 Marks
Fig. 2.1 is a photomicrograph of a longitudinal section (LS) through a root tip. Two different regions are visible: • the root apical meristem • the root cap. Cells in the root cap synthesise a gel-like, sticky secretion known as mucilage, which is important in reducing friction between soil and the growing root. It is composed mainly of polysaccharides and also contains some amino acids and enzymes. [Figure 2.1]
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