Chapter 4 part 2, meristems. day 4

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Plants get bigger by...

- cell division and cell elongation
Meristems

-area of unspecialized tissue

-where cell division occurs in most plants
Initials

-meristimatic; ability for dividing cells
Derivatives

-cells no longer divide

-forms special tissue types

-"mature" cells
(Meristem types) Apical meristem

- apex or tip (root, stem, branch)

- increase length

-in youngest part

-hebeceous plants (non-woody) and annuals
(Meristem types) Primary meristems

-next to apical meristem

-cells both dividing and specializing

- in roots and stems

-form primary tissues
3 types of meristems

protoderm, ground meristem, and procambium
Primary tissue formed...Protoderm?

Dermal- Epidermis
Primary tissue formed...ground meristem

ground-parenchyma
Primary tissue found...Procambium

Vascular- Xylem and Phloem
label them....
- root camp
- root apical meristem
- proderm
- ground meristem
- procambium
- epidermis
- cortex
- vascular cylinder
Lateral meristems (cambium, secondary meristems)

-inside of the plant

-forms when plant is older

-increases width or diameter

-woody plants

-older plants or perennials

-forms secondary tissue
Intercalary and basal meristems
-within the stem or at base of stem

-between the other stems
- - in grasses, found at the base of plant
- ex) Basal meristem is why we have to cut grass
Marginal meristem

-at edge or margin

-add cells to outside of a leaf

ex) explains why in spring leaves seem to grow quickly
Floreal meristems

-form flowers rather than leaves