it depends
Perhaps. There are water plants however that have roots, stems, and leaves.
No. Pond scum does quite well without either.
no leaves are a component of plants (stems, leaves and roots)
Xylem are small tubes in vascular plants that carry water up from the roots to its leaves etc
Yes, all land plants have leaves. It is proving true because all plants do but grass. Because is like a weed and sea plants don't count. Because this theory is for just land. And don't listen to B.C.B is his is a non believer
Desert
no it occurs in the leaves
Nonvascular plants.
Xylem tissue carries material from a plant's roots to it's leaves
they connect the roots to the leaves and hold the plant up they carry the food to the leaves from the roots
All flowering plants have leaves, as well as most non-flowering plants (ferns, gymnosperms etc.).
There is no specific place which could be generalized for all plants. However, all fruit producing plants store excess sugars in fruits. It is stored in roots of plants with edible roots such as carrot and beetroot. It is also stored in stems of certain plants and in leaves of some plants.