Assumed audience
General adult, no formal biology required. The goal is to understand how plants are built.
The plant body
Plants have three primary organs — roots, stems, and leaves. Roots anchor the plant and absorb water and minerals from the soil. Stems provide structural support and house the vascular system. Leaves are the primary sites of photosynthesis.
Vascular tissues
Two transport systems run through the plant body. Xylem carries water and minerals upward from roots to leaves. Phloem carries sugars and signaling molecules from leaves to the rest of the plant. Together they connect every part of the plant into a coordinated whole.
Meristems
Meristems are regions of undifferentiated cells that produce new growth throughout the plant’s life. Apical meristems at shoot and root tips drive primary growth (elongation). Lateral meristems (vascular cambium) drive secondary growth (thickening).
Chloroplasts
Chloroplasts are the organelles inside leaf cells where photosynthesis occurs. They contain chlorophyll, which captures light energy.
Stomata
Stomata are pores on leaf surfaces that regulate gas exchange — admitting CO2 for photosynthesis while managing water loss.
Why this matters
Understanding plant anatomy is prerequisite to understanding how plants grow, reproduce, and interact with their environment.