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

This showed up in chemistry, so I don't have much for you. But I can tell you that your #5 is upside down. Xylem transports water and minerals up from the roots and phloem transports sugars down. It makes sense; the photosynthetic portions of the plant are above the roots, and the sugars produced must be transported down, while water and minerals from the ground are absorbed by the roots and need to be distributed up through the plant.

Answer 2

http://en.wikipedia.org/wiki/Root

This link will answer most of your questions.

Good luck!