Question

how does the expose tissue of cortex become protected when primary epidermis fall off in stem

Answer 1

So that it can protect exposed tissue, a layer of meristematic cells, cork cambium, or phellogen rises from the cortex.

The cells of phellogen divide and create new cells.On both sides towards the cortex are parenchymatous, they form a secondary cortex or phelloderm while the cells on the outside of the phelloderm are rectangular and arranged in radial rows. They secrete suberin inside their wall then die off. These cork tissues functions as a barrier of sorts to protect the plant from outside threats.

Suberin - Waxy substance 

Parenchymatous - The basic tissue of plants 

Hope this helps six days late 

Answer 2

The primary epidermis splits, dries and falls off during secondary growth. Cork cambium emerges in the cortex to protect exposed tissues and enhance diameter.

What is primary epidermis?

• "Primary dermal tissues make form the epidermis, or outer layer, of all plant organs (e.g., stems, roots, leaves, flowers)."
• They help to avoid both excessive water loss and insect and microbial invasion.

What is secondary growth?

• "Secondary growth refers to the expansion of the girth caused by the lateral meristem."

What is cork cambium?

• The cork cambium is a type of epidermal tissue found in a variety of vascular plants.
• It is one of the numerous layers of the bark, located between the cork and the major phloem.
• The cork cambium is a lateral meristem that is responsible for secondary growth in the roots and stems, replacing the epidermis.

What is cortex?

• "The cortex is a layer of unspecialized cells present between the epidermis (surface cells) and the vascular."

Hence, the cork cambium emerges in the cortex to protect exposed tissues and enhance diameter.

To know more about secondary growth here

https://brainly.com/question/1615973

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