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Stem hairs are important to plants for a few reasons. These stem hairs both help protect the plant and transport essential nutrients and water.
If you mean the fuzz that some plants have I have absolutely no idea why but they're called pubescents. They may have different functions depending on the type of plant, normally associated with protection from insects or dehydration. See related link
LOOK IN A PLANT FOR ITS STERN IF IT HAS ONLY A STREN AND NOT A PISTILE THAT MEANS IT IS A MALE
what is the plants have no stem
feather,roots
To find pictures of plants that grow from stems you can type that description into Google Images. The rose is one plant that can grow from a stem.
it keeps the plants safe because some animals don't like the hairy texture
There are no plants in Alberta that are grown for "stem."
Typically on the leaves, although some plants have modifications that allow for photosynthesis in the stem.
A woody stem
Rubarb stem
These things are considered: the shape of the leaves the margin of the leaves - serrated how the leaves are arranged on the stem - alternate, opposite etc if the leaves have hairs how the leaf blade is divided (or not) what the leaf stem is like what the veins of the leaf blade are arranged