5 Questions
Explain the process by which the bark is developed from the tissues of the young stem and the activity of meristematic cells involved in this development.
The bark is developed from the tissues of the young stem due to the activity of two circles of meristematic cells: the inner circle, which is the vascular cambium, and the outer circle, which is the phellogen (cork cambium). The vascular cambium produces wood (2nd xylem) towards the interior of the stem and bast (2nd phloem) towards the exterior. The cork cambium (phellogen) produces cork cells (phellen) towards the exterior and phelloderm (Secondary cortex or Cork parenchyma) towards the interior.
What are the three main areas of the composition of the bark external to the vascular cambium?
The three main areas of the composition of the bark external to the vascular cambium are: outer bark, middle bark, and inner bark.
Describe the characteristics and composition of the outer bark.
The outer bark includes all tissues produced on the outer side of the cork cambium (phellogen) and is the cork region, with cell walls impregnated with suberin.
Explain the middle bark and its location in relation to the outer and inner bark.
The middle bark is the area between the outer bark (cork) and the phloem (inner bark), and it is the cortex region.
What is the significance of the shapes of bark during drying, according to the text?
The significance of the shapes of bark during drying is that the bark tends to curve transversely, resulting in various concave forms but remains longitudinally straight.
Learn about the definition and formation of bark in woody plants, including the role of vascular cambium and phellogen (cork cambium). Understand how the bark develops from the tissues of the young stem.
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