Question

What is periderm? How does periderm formation take place in dicot stem?

Answer 1

Answer:

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Explanation:

Periderm is a component of secondary growth that is formed towards the surface of stems and roots, having phellem, phellogen and phelloderm. Phellogen or cork cambium develops in a subepidermal layer in the stem and from pericycle in roots, its cells undergo bipolar division. The cells formed on the outer side undergo suberization, deposition of tannins and death of cellular contents. The outer tissue of dead suberised cells is called cork or phellem. At places, it contains lenticels or aerating pores having loosely arranged suberised complementary cells. Cells formed by phellogen on the inner side constitute secondary cortex or phelloderm.

Answer 2

The exterior cover of some plants, especially woody plants the oute layer is usually referred to as periderm.

Step by step explanation:

• Periderm mainly composed of three parts such as  phellogenes, phellems, and phelloderms.

• Because of the cambium, the outer epidermal layer and the cortical layer are separated during secondary development.

• The cortex cells transform meristematic to kill them, giving rise to cork cambium or phellogene.
• This consists of thin-walled, triangular, and small cells.

• Phellogen kills cells on either side of it.
• The cells cut off outwardly give rise to the phellem or cork.

• The deposits of suberin in its cell wall make it impermeable to water.

• The inner cells give rise to the phelloderm or secondary cortex.
• The secondary cortex is called parenchymatous .

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