2. A young root –the first organ to emerge during seed germination---WHY?

4. Adventitious roots

6. Root tip
Slimy layer
root hairs
rootcap
Root apical meristem

8. epidermis
cortex
Cross section of primary root
endodermis
Vascular cylinder
stele

9. pericycle
Primary xylem
Primary phloem
xylem
Cross section of primary root

10. Dicot root cross section
Stele:
A = xylem
B = phloem
C = endodermis
Dicot root cross section

11. storage

12. Pneumatophores -- for gas exchange in waterlogged soil

13. Contractile roots --thickened specialized roots at the base of a corm, bulb, or other organ which is designed to shrink vertically under conditions of seasonal drought  that helps position this plant part at an appropriate level in the ground.

14. Haustoria – suckers of parasitic plants for obtaining nutrients from their hosts

15. Mycorrhizae –mutualistic relationship between plant roots and fungi
Pinus strobus with
Amanita muscaria

16. Root nodules --–mutualistic relationship between plant roots and N-fixing bacteria