Plant Histology II. Primary Growth. MERISTEMATIC TISSUE. Meristems: - Permanent regions of active cell division - (undifferentiated plant tissue) = plant “stem cells” 3 types of meristematic tissues Apical Lateral intercalary. Apical Meristems.
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- (undifferentiated plant tissue)
Found at the tips of roots and shoots.
= can later be modified.
Loosely packed (Called aerenchyma)
2 TYPES OF CELLS (based on cell-shape)
= Chief conducting tissue forwaterand mineralsabsorbed by the roots.
3 TYPES OF XYLEM TISSUE
Phloem cells as seen in longitudinal section. Note the longitudinal view of the sieve plate inside the large sieve tube cell
1. Sieve Tube Members
2. Companion Cells
Acts mainly as a storage place for food.
They store many secondary metabolites such as tannins, starch, crystals, etc.
Fibres are very common in phloem
(scleroids less common)
(One cell-layer thick)
* Most secrete fatty substance (cutin) on the surface of the outer walls.
= Outer bark