Stem regions at which leaves are attached are called
trichomes
lenticels
nodes
internodes

Nodes

Explanation:

A node is a stem zone where the leaves are attached, the stem portion between nodes are called internodes, the thricomes are like little hairs in the leave and the lenticels are spaces in the leave that helps to transpiration like the stomata.

So, the stem regions at which leaves are attached are called nodes.

Also the name nodes is really common in gardening, it helps a lot to identify which leave are they talking about.

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