Stems Flashcards
Download diagram
Of pine stem cross-section
Reading assignment
Stems
Primary growth
The growth in length of a stem, branch, or root
Primary meristems
Found at the tips of the roots, stems, and branches
Secondary growth
The growth in width of a stem, branch, or root. Due to secondary meristems
Secondary meristems
Vascular cambium and cork cambium
Dicots and gymnosperms
Secondary growth is possible. Stems are thicker, as layer of xylem grows outwards
Growth rings
Represent the sensual growth patterns of xylem
Monocots
No secondary growth
Wood
Xylem tissue
Tracheid cells
Make xylem a tough, fibrous tissue
Angiosperm xylem
Contains vessel element cells
These are very tough
Hardwoods
Oak, cherry, alder
Underground stems
Rhizomes, bulbs, corms, tubers
Eg potato
How does water move up a stem?
Review the transpiration-cohesion theory
