Seed Plant Structure

Seed Plant Body Structure

• Composed of three organs: leaf, stem, and root.

Plant Meristems

• Plant growth is limited to specific regions where cells retain the capacity for continued cell division.
• Unlike animals, which have a generalized growth pattern.

Sclerenchyma

• Function: provides mechanical support (strength) due to thick lignified secondary walls.
• Contain large amounts of cellulose and lignin.

Sieve Cells and Plates

• Contain many pores that allow for cell-to-cell solute transport.
• Sieve plates consist of primary pit fields and occur in the end walls of cells.

Primary Meristems

• Apical meristem of the root organizes to form three primary meristems:
• Protoderm: gives rise to the epidermis.
• Procambium: produces xylem and phloem.
• Ground meristem: produces the cortex.