Please answer as many questions as you can on Biology?

Question

Im studying for a test and was wondering these answers...thx....
DEALING WITH ROOTS.

1. explain how root tip moves through soil

2.what is a stele

3.Why are old roots and stems identical in terms of tissues and functions.

4.Why are there no root hairs on old sections of the root

5. Ehy do biologists associate downward material movement with xylem and upward with phloem.

6.Explain how vascular cambium produces more xylem each year and how it contributes to secondary development

Answer 1

1.It moves with "hope" that will find minerals salts, and other organic materias...
2. it's the part of the root, i think...
3.Because their cells are metrabolicly slower than younger ones, and the tissues have much weaker funcs than before..
4.the plant is dying...(?!)
5./
6.the plant is growing in the side (don't know how to explain it in engl...) :))