Question

Which of the following does not occur in secondary growth in a typical dicot root?
Primary phloem
Annual rings
Vascular cambium
Pericycle

Answer 1

Answer:

Concept:

Secondary growth helps in production of wood in tall trees.

Explanation:

• The secondary increase in thickness is most pronounced in dicotyledonous stems and roots.
• Cork is discovered in dicot roots that have secondary growth. A dicot root's thickness increases due to the presence of parenchyma cells beneath the phloem group, resulting in cambium strips.
• This expansion is brought on by the cambium and periderm, two secondary vascular cells.
• Secondary growth, which results from cell division in the cambia or lateral meristem, enlarges the thickness or girth of the plant.
• The development of secondary tissues by lateral meristems causes the secondary growth in the root.
• Like dicotyledonous stems, the majority of dicotyledonous roots exhibit secondary growth in thickness. It happens when the cambium and periderm, two different kinds of secondary vascular tissues, reappear. Cork cambium and vascular cambium are the two tissues that meristems produce.
• Annual rings are formed in dicot stems during secondary growth.

Hence, annual rings does not found in dicot root.

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