Assuming that you're asking how to hide the stems: flowers without stems can only be arranged in a flat arrangement, probably glued to some form or floating in water.
When arranging flowers in a glass vase and you want to hide the stems, you can fill the vase with marbles, or other objects. You could also use a double vase, and fill the outside vase with some interesting visual material.
Usually when arranging flowers in a non-glass vase, you can arrange the tallest flowers at the back or in the middle of the arrangement, then add shorter flowers to hide the taller flowers' stems, and so forth, so that the outside row's flowers rest on the lip of the vase.
You just do it like how you arrange real flowers. Though you can just bend the stem for the fake flowers with wire-stems. You can also have someone do it for you (the store that sells them.)
The flowers are held on stems that are sturdy enough to hold them in an upright position without leaning over.
No
The collective noun is a bouquet of flowers.
they are pink and have stems
A stem is a support for the leaves and flowers on the plant.
They would differ by how the flowers are. If the leaves, seeds, and stems are different then another then it would be hard to say how they differ.
Florets are small flowers on the stems of certain vegetables. Broccoli and cauliflower for example, have florets at the top of their stems.
trees
Usually stems hold flowers, leaves, and fruit on plants.
Examples of plants that have roots, stems, and leaves but do not produce seeds are flowers. Flowers have roots, stems, and leaves; and reproduce by pollination with the help of bees, and other insects.
yes, flowers breathe through tiny holes in there leaves and stems called pores