alleryStart learning →The periderm of a woody stem is made up of which three components?
ACork cambium, cork cells and phelloderm
BCork cambium, epidermis and phelloderm
CVascular cambium, cork cells and cortex
DVascular cambium, epidermis and pith
Answer & Solution
Correct answer: A. Cork cambium, cork cells and phelloderm
1. The cork cambium produces cork cells outwards and a layer called phelloderm inwards.
2. Those three together, the cork cambium, the cork cells and the phelloderm, are the periderm.
3. The periderm substitutes for the epidermis in mature plants, so the epidermis is not one of its parts.
4. The vascular cambium belongs to the inner secondary tissues and is not counted in the periderm.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.2 Stems_
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