Lateral Meristems and Secondary growth

Lateral Meristems type of growth and tissues

1. Increase in diameter due to secondary growth (expansion) 2. Produces secondary tissue

2 lateral meristems secondary tissue both are rings that retain what and produce what

cell division properties and produce rings of secondary tissues to the inside/outside of cambium ring

2 parts of lateral meristems

1. vascular cambium 2. cork cambium

Vascular cambium

produces ring of secondary xylem(wood) to the inside and ring of secondary phloem(inner bark) to the outside

Cork cambium 1. produces what 2. found where 3. happens when

1. produces rings of periderm (outer bark) that replaces the epidermis and cortex in external protection 2. found Inside the epidermis 3. happens late in 1st year after surviving winter

when do Woody plants produce both primary and secondary tissues

1. begin life with only primary vascular systems 2. Produce secondary vascular tissues and bark as they mature

woody plants Form vascular cambium of

1. secondary xylem 2. secondary phloem

Secondary xylem

wood

Secondary phloem

inner bark

woody plants also Form cork cambium which is

Bark has both outer bark(periderm) (mostly dead cork cells) and inner bark (secondary phloem)

Secondary growth in stems (eudicots) begins when

1. Begins late in the 1st year of growth

Educate stem after 3 years of secondary growth gets

3 rings of xylem